the mass of the H2CO3 produced = 0.351 g and the percentage yield of H2CO3 = 24.9% Solution:- 2NaHCO3 → Na2CO3 + H2CO3 since we know that no of moles = mass / molar mass molar mass…
The statement of "the mass of the H2CO3 produced is 1.31 g and the the percentage yield of H2CO3 is 96.43%."
What is percentage yield?The percentage yield is the percent ratio of actual yield to the theoretical yield. It is obtained by dividing the observed yield by the theoretical yield and multiplying by 100%.
Given:
2NaHCO3 → Na2CO3 + H2CO3
3.81 g of NaHCO3, 2.86 g of Na2CO3
Solution:
One mole of sodium carbonate and one mole of hydrogen carbonate are produced from two moles of sodium bicarbonate.
Gram to mole conversion,
[tex]3.81\;.\frac{1\;mole}{84\;g}\;=\;0.0453\;mol\;of\;NaHCO3\\2.86\;.\frac{1\;mole}{105.98\;g}\;=\;0.0269\;mol\;of\;Na2CO3[/tex]
Initially to find the mass of H2CO3, moles of H2CO3 can be calculated by using the determined moles of NaHCO3.
[tex]0.0453\;mol\;NaHCO3.\frac{1\;mol\;H2CO3}{2\;mol\;NaHCO3}\;=\;0.0227\;mol\;H2CO3[/tex]
So, the moles of hydrogen carbonate
[tex]0.0227\;mol\;H2CO3.\frac{62.03\;g\;H2CO3}{1\;mol\;H2CO3} = 1.408\;g\;H2CO3[/tex]
Therefore the mass of the product is 1.408 g.
The actual yield of H2CO3 can be determined from mass of sodium bicarbonate and sodium carbonate.
Mass of H2CO3 = Mass of NaHCO3 - Mass of Na2CO3
Mass of H2CO3 = 3.81 g - 2.86 g
Mass of H2CO3 = 0.95 g
Now the percent yield,
% yield
[tex]= \frac{experimental\;yield}{theoretical\;yield}. 100\\= \frac{0.95\;g}{1.408\;g}. 100[/tex]
= 67.47%
≈ 67.5%
Therefore, the percentage yield of the product is 67.5%.
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Please help me I’m desperate plz help and fast
Answer:c
Explanation:
Please help me please find the answer
Please find attached photograph for your answer. Hope it helps! Please do comment
Pure substances can be elements or compounds. An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. A compound is a substance composed of two or more different types of elements ,chemically combined in a fixed ratio. 2.(a) Elements and compounds are called as pure substances because it is made up of _________________ *
a.same kind of atoms or molecules
b. different kinds of atoms or molecules
c.heterogeneous mixtures
d.solutions
Answer:
a.same kind of atoms or molecules
3. Which of the following quantities is a density? (hint check your units!)
a. 9 cal/g
b. 100 cm/m
c. 1.5 gL
d. 454 g/lb
if c is 1.5 g/L
gram/ liter
then its a density unit
then its a density quantity
What is the mass of 4 moles of fluorine (F) atoms?
The Periodic Table
O A. 2.41 x 1024 g
O B. 76.0 g
O C. 4.58 x 10259
O D. 19.09
Answer:
the mass of fluorine in 4 moles is going to be 76.0 g
Answer:
[tex]\boxed {\boxed {\sf B. \ 76.0 \ g }}[/tex]
Explanation:
We are asked to find the mass of 4 moles of fluorine atoms.
We will convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. These values are found on the Periodic Table. They are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up fluorine's molar mass.
F: 18.9984032 g/molWe will convert using dimensional analysis so we must set up a ratio.
[tex]\frac {18.9984032 \ g \ F}{ 1 \ mol \ F}[/tex]
We are converting 4 moles of fluorine atoms to grams, so we multiply this value.
[tex]4 \ mol \ F *\frac {18.9984032 \ g \ F}{ 1 \ mol \ F}[/tex]
The units of moles of fluorine cancel.
[tex]4 *\frac {18.9984032 \ g \ F}{ 1}[/tex]
A fraction with a denominator of 1 is equal to the numerator, so we can ignore the denominator.
[tex]4 *18.9984032 \ g \ F[/tex]
[tex]75.9936128 \ g \ F[/tex]
Let's round to the tenths place. The 9 in the hundredth place tells us to round the 9 in the tenths place to a 0, then the 5 in the ones place rounds to a 6.
[tex]76.0 \ g \ F[/tex]
4 moles of fluorine atoms are equal to 76.0 grams of fluorine and choice B is correct.
Think of the arrangement of an atom and how different elements behave when exposed to heat. How do fireworks operate? What is moving within the atom? In your response make sure that you use the terms: ground state, excited state, photon, wavelength, energy, emission spectra and orbital.
Explanation:
How Fireworks operate
Fireworks contain an explosive powder, along with a binding paste, mixed with the signature chemicals responsible for its bright colors. ... The wavelength, and so the color of the light emitted, is fixed by these energy differences, giving each substance a "fingerprint" line emission spectrum. When the fireworks explode, electrons within the atoms of these different elements absorb energy and get “excited” which causes them to move into the higher energy orbits. When they come down to lower energy orbits, photons are released which allow us to see the great colors during a fireworks show. The electrons of the aluminum atoms absorb heat energy and become excited. The excited energy level the of electrons are energy level 2 or n=2 and above. ... Then electrons of lose the energy and fall back down to ground state which at energy level .This is also how a firework works on an atomic level.
Hope it helps :)
In this list, which substance can be classified as a chemical?
Complete Question is attached below
We have that the Chemical is
Salt
From the Question we have options
Salt
Sleep
Sold
Heat
Temperature
Generally among est the options
Salt is the only chemical present as it is made of Sodium and chlorine compound
NaCl joined by an ionic bond
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calculate the volume of CO₂ at NTP occupied by 44.4g of heat
We know at NTP each gas has 22.4L of volume .
[tex]\boxed{\sf 1mol\:of\:CO_2=22.4L=44g}[/tex]
Hence 1g of CO2 contain
[tex]\\ \sf\longmapsto \dfrac{22.4}{44}[/tex]
[tex]\\ \sf\longmapsto 0.5L[/tex]
Now 44.4g of CO_2 has
[tex]\\ \sf\longmapsto 0.5\times 44.4=22.2L[/tex]
HELP ME !!!!!!!!!!!!!!
Answer:
The substance is gloucuse based.
How do robots help scientists to perform experiments?
A.Robots go places humans are unable to go.
B.Robots are smarter than humans.
C.Robots increase the risk of an experiment.
D.Robots slow down data acquisition.
Answer:
A. Robots go places humans are unable to go.
Which of these processes indicates that smelting copper is a chemical change?
Answer:
where are the opitions?
Explanation:
An atom that has lost electrons is a:
Answer:
The atom that has lost an electron becomes a positively charged ion (called a cation)
PLEASE MARK ME BRAINLIESTAnswer: it’s a cation
Explanation:
Which of the following best describes an electron orbital? (electron orbital)
a) A circular path in which an electron "orbits” around a nucleus.
b) A location around the nucleus in a sphere where the electron is likely to be located.
c) An elliptical path around the nucleus.
d) The nucleus
Answer:
D
Explanation:
Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The atomic mass and natural abundance of Si-28 are 27.9769 amu and 92.2 %, respectively. The atomic mass and natural abundance of Si-29 are 28.9765 amu and 4.67 %, respectively. Find the natural abundance of Si-30. Express your answer numerically using two significant figures.
Answer:
3.1%
Explanation:
100% - 92.2% - 4.67% = 3.1% (2 s.f.)
What is Equilibrium? I’m a little confused on the topic. You’ll get a lot of points if you answer I think.
Answer:
to put it simply, equilibrium is when two opposing forces balance each other out. one example is boats: you know how the bottom half is curved, and then meets at an edge? they design it like that because of water displacement. by gravity, the water wants to go back to the area taken by the boats mass (the parts where it has sunken into the water), thus preventing the boat from sinking. once the boat is removed, the water returns to the space. most liquids take form of their container.
13. Find the total number of atoms present in the following molecules.
a. 5 H₂O
b. Zn Cl₂
Answer:
zxcdfzdg
Explanation:
zszghzd
Homework 2
1. A scientist is attempting to check the relative atomic masses on the periodic table. He works
with three different compounds that contain only C and another compound. These are
diatomic compounds with a formula of CX. He finds the following information. If he
assumes the weight of C is 12 what is the weight of the other element and its identity.
Wt C
Wt X
Compound 1
4.2
4.9
Compound 2 3.5
4.67
Compound 3 1.3
3.47
the concepts of mole and chemical reactions, the element of the three compounds can be found.
compound 1 carbon - Nitrogen CN
compound 2 carbon - Oxygen CO
compound 3 carbon - Sulfur CS
Chemical reactions are expressed in moles of each constituent element. The mole is one of the fundamental quantities of physics and is defined as the amount of matter in 0. 012 kg of carbon 12, in practical form the moles of a given element in a chemical reaction is found with the expression
n = m / Pm
where n is the number of moles, m the mass of the element and PM the molecular weight (taken from the periodic table) of the element.
Let's apply to our compounds as the chemical formula is CX, there is an atom of each element, let's look for the moles of carbon.
compound 1
mass of coal 4.2
carbon mole
n_C = 4.2 / 12
n_C = 0.35 mol
as in the chemical reaction there is an atom of each element, there are also 0.35 moles of the unknown element, let's find its molecular weight (PM)
PM = m / n
PM = 4.9 / 0.35
PM = 14 gr / mol
When reviewing the periodic table this weight corresponds to Nitrogen(N)
The elect is Nitrogen
compound 2
carbon mass 3.5
carbon moles
n_C = 3.5 / 12
n_C = 0.29167
moles of unknown element n = 0.29167
mass of unknown element m = 4.67
molecular weight
PM = 4.67 / 0.29167
PM = 16 gr / mol
Checking the periodic table corresponds to the element Oxygen (O)
Compound 3
carbon mass 1.3
carbon moles
n_C = 1.3 / 12
n_C = 0.1083
moles unknown element n = 0.10833
mass unknown element m = 3.47
PM = 3.47 / 0.10833
PM = 32 gr / mol
In the periodic table the element Sulfur (S) has this molecular weight
Using the concepts of mole and chemical reactions, the elements of the three compounds can be found.
compound 1 carbon - Nitrogen CN
compound 2 carbon - Oxygen CO
compound 3 carbon - Sulfur CS
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help please !
33. When a hypothesis is not correct a good researcher would rewrite the hypothesis and then re- test it.
True
False
34. A successful experiment is one that can be analyzed and explained, even if the answer is not what the researcher expected.
True
False
35. A successful experiment often leads to more questions.
True
False
Answer:
false
true
true
Explanation:
false - changing the hypothesis to meet your needs is not a good researcher
true - when you can further analyze and explain then you have a successful experiment even if it's not what you expected
true - successful experiments do not end there. they can lead to more in depth questions.
If the density of methanol is 0.791g/ml, what is the mass of 0.750L of methanol
Explanation:
[tex]d = \frac{m}{v} \\ m = d \times v \\ m = 0.791 \times 750 \\ m = 593.25 \: g[/tex]
I need help with unit conversion showing my work
45.75 qt to mL
Can someone do this for me!!????PLEASEEEE
Answer:
no that's worth points
Explanation:
What does a surface area/volume ratio of6:1 mean for the cells ability to get the materials it needs that move across its surface
Answer:
i don't knoww
Explanation:
i don't know
Answer
Choice A
Answer
Choice B
Answer
Choice C
Question
A scientist hypothesizes that a new medication can reduce
the chances of catching a cold Which of these would most
likely be the dependent variable in a study involving this
medication?
//
The participants
who do not receive
the medication
Color PURPLE
The number of
participants who
catch a cold
Color YELLOW
The age of the
participants
Color GRAY
Tt remains the
T+ is purposely
It is used for
Answer:
what is the question????
How do I calculate the volume?
Answer:
2477.6 cm³
Explanation:
Volume = length x width x height
Label in cm³
Below is the Lewis structure for methane.
HELPP!!
Based on its Lewis structure, what is the correct shape of a methane molecule?
A.
tetrahedral
B.
trigonal planar
C.
trigonal pyramidal
D.
bent
Answer:
C. trigonal pyramidal ..
Choose all of the answers that are correct when describing this atom.
This is Chlorine
This is bromine
The mass of this is atom is 35 amu.
This atom has an overall charge of 0
The mass of this atom is 69 amu
To solve this question, it is important look at the pictue of the atom. The atom has the following properties:
17 protons17 electrons18 neutronsNow, let's judge each affirmation
This is Chlorine --> CorrectTo indentify what element is this atom, we should know what is its atomic number. The atomic number is equal to the number of protons in the atom. In our atom, we have 17 prontos, so, the atomic number is 17.
In the Periodic Table, the atomic number is above of letter that represents the elements. For example, the atomic number of the Helium (H) is 1.
Now, let's look to the Periodic Table and find the element of the atomic number is 17. The element that the atomic number is 17 is Chlorine. So, this affirmation is true.
This is Bromine --> IncorrectWe saw before that is a atom of Chlorine, because its atomic number is 17. The atomic number of Bromine (Br) is 35.
The mass of this atom is 35 amu --> CorrectThe mass of any atom is equal the sum of the number of protons and the number of neutrons. This happens because the mass of the electrons is negligible. So, let's calculate the mass of our atom:
[tex]mass = protons + neutrons\\mass = 17 + 18\\mass = 35[/tex]
Therefore, the mass of this atom is 35 amu, so the affirmation is correct.
This atom has an overall charge of 0 --> CorrectAny atom has a overall charge different of 0 if the number of protons and electrons are different.
In our case, the number of protons and alectrons are equals, so the overall charge is 0. So, the affirmation is correct.
The mass of this atom is 69 amu --> IncorrectWe saw before (third affirmation) that the mass of this atom is 35 amu. So, this is a incorrect affirmation.
I hope I've helped. ^^
Enjoy your studies! \o/
Musical instruments like trumpets and trombones are made from an alloy called brass. Brass is composed of copper and zinc atoms and appears homogeneous under an optical microscope. The approximate composition of most brass objects is a 2:1 ratio of copper to zinc atoms, but the exact ratio varies somewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneous mixture, or a heterogeneous mixture
Answer:
There are various substances found in nature, which are classified as an element, compound, and mixtures. Elements are pure substances, which are found in the simplest form, compounds are formed by the combining of two or more atoms of the same or different elements. Mixtures are categorized into homogenous and heterogenous, which are based on the composition of the mixture.
Explanation:
The homogenous mixtures are defined as the mixtures in which substances or components are evenly distributed and cannot be distinguished by each other. For example, detergent, air, and water. Alloys are also considered homogenous mixtures because the elements are mixed in some particular ratio. For instance, brass and steel are such types of homogenous alloys. In brass, the solid solution of copper and zinc are mixed in a specific ratio (2:1). However, the different instruments have different ratios of brass. The brass is classified as a homogenous mixture. In contrast, heterogeneous mixtures are those in which the composition of substances is not uniform. For example, oil and water.
c. Who is faster, the runner who runs a mile in 8 minutes or the runner who runs a
kilometer in 4 minutes?
Answer:
the runs a mile in 8 minutes is faster
Pioneer 10 is a 267.1-kilogram robotic space probe that completed the first interplanetary mission
to Jupiter, and became the first spacecraft to achieve escape velocity from our solar system. How
much does it weight in pounds (lbs)?
Answer: 588.9 lbs
Explanation: 1 lb = 0.454 kg
(267.1kg)*(1 lb/0.454 kg) = 588.9 lbs
(WILL MARK BRAINLIEST)SOME1!! Trying to Turn this In! Please HELP ASAP! SOME1?
1. Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?(1 point)
The relationship is directly proportional; as temperature increases, volume decreases in the same way.
The relationship is inversely proportional; as temperature increases, volume increases in the same way.
The relationship is inversely proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.
2. Which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant?(1 point)
An increase in pressure causes particles to move closer together, decreasing the volume.
An increase in pressure causes particles to move farther apart, decreasing the volume.
An increase in pressure causes particles to move closer together, increasing the volume.
An increase in pressure causes particles to move farther apart, increasing the volume.
3. The ideal gas law is represented by PV=nRT. As volume is held constant and the temperature increases, how would the pressure be expected to change?(1 point)
It would remain constant.
It would increase.
It would become zero.
It would decrease.
4. When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?(1 point)
V
R
T
n
5. Two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quantity can differ between the two gases?(1 point)
the molar volume of each gas
the gas constant of each gas
the mass of each gas
the number of moles of each gas
Answers
1) the relationship is directly proportional, as temperature increases, volume increases In the same was.
2) an increase in pressure causes particles to move closer together, decreasing the volume.
3) it would increase
4)V.
5) the mass of each gas
1) The relationship between volume of a gas and its temperature, in Kelvin, assuming pressure is held constant is best shown by the statement; "The relationship is directly proportional, as temperature increases, volume increases in the same way."
2) The statement " an increase in pressure causes particles move closer together, decreasing the volume." explains the changes that occur when pressure is increased at constant temperature.
3) From the ideal gas law, the pressure increases as temperature increases
4) Following from Boyle's law; the volume decreases as the pressure increases.
5) The number of moles of each gas of each gas can be different.
Charles law states that; the volume of a given mass of gas is directly proportional to its temperature at constant pressure. This implies that, given a mass of gas, the temperature increases as the volume increases at constant temperature.
According to Boyle's law the volume of a given mass of gas is inversely proportional to its volume at constant temperature. This simply implies that as pressure increases as volume decreases(inverse proportionality and vice versa).
The pressure and temperature are directly proportional to each other when other variables are held constant.
From Avogadro's law, the volume of a given mass of gas is directly proportional to the number of moles( V α. n). Therefore, the number of moles of each gas of each gas can be different when the gases are held at the same pressure, volume, and temperature.
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