Answers
1) 1.04 M
2) 4.02 M
__________________________________________________________
Explanation:Part 1:We are given:
Number of Moles (n) = 0.65 moles
Volume of Solution (V) = 1.6 L
Solving for the Molarity:
We know that:
Molarity = nV
(where n is the number of moles and V is the volume of the solution in L)
replacing the variables
Molarity = 0.65 * 1.6
Molarity = 1.04 M
Hence, the Molarity is 1.04 M
__________________________________________________________
Part 2:We are given:
Volume of Solution = 825 mL OR 0.825 L
Mass of MgS = 28.7 grams
Number of Moles of MgS:
Number of moles = Given mass / Molar mass
Number of Moles = 28.7 / 56.38 [molar mass of MgS = 56.38 g/mol]
Number of Moles = 0.51 moles
Molarity of the Given solution:
We know that:
Molarity = nV
[where n is the number of moles and V is the volume of the solution in L]
replacing the variables
Molarity = 0.51 * 0.825
Molarity = 0.42 M
Hence, the molarity is 0.42 M
Related Questions
9. What do the results tell you about your hypothesis(es)?
Someone help please
Answers
Explanation:
A hypothesis is a scientific guess into a phenomenon. Results can either support a hypothesis or falsify them.
The findings that results from an experiment are the results on which the claim on a hypothesis is predicated.
When results conflicts with the hypothesis statement, such a conjecture can no longer hold true and therefore, it would be modified or completely discarded. If results supports a hypothesis, then the conjecture is accepted and passed on to further scientific procedure.Avogadros number is used to determine the number of subatomic particles in an atom. True or false
Answers
Answer:
False
Explanation:
The Avogadro's number is not used to determine the number of subatomic particles in an atom.
Subatomic particles of an atom are the protons, neutrons and electrons.
The protons are the positively charged particles in an atom
Neutrons do not carry any charges
Electrons carry negative charges.
The number of protons, neutrons and electrons in an atom are experimentally determine using spectrometric techniques.
Answer:
false
Explanation:
Key Concepts
4 Identify What are three advantages of using
conceptual models?
Help plz
Answers
Answer:
A Broad View of Concept Modeling
Establishing Key Relationships
Levels of Concept Modeling
Explanation:
Can you use mass and volume to predict whether an object will sink or float in water? Explain your thinking.
Answers
Answer:
Yes. u can because its easy to tell if an item will sink or float usually by the weight or the width
Explanation:
Based on electronegativity, select the molecule with the most ionic character. Group of answer choices SBr2 OBr2 SeCl2 TeI2 SCl2
Answers
Answer:
OBr₂
Explanation:
The ionic character depends on the difference of electronegativity between the elements. The higher ΔEN, the greater the ionic character.
SBr₂
ΔEN = |EN(S)-EN(Br)| = |2.5-2.8| = 0.3
OBr₂
ΔEN = |EN(O)-EN(Br)| = |3.5-2.8| = 0.7
SeCl₂
ΔEN = |EN(Se)-EN(Cl)| = |2.4-3.0| = 0.6
TeI₂
ΔEN = |EN(Te)-EN(I)| = |2.1-2.5| = 0.4
SCl₂
ΔEN = |EN(S)-EN(Cl)| = |2.5-3.0| = 0.5
OBr₂ is the molecule with the most ionic character.
A 1.20-L container contains 1.10 g of an unknown gas at STP. What is the molecular weight of the unknown gas?
A) 1.32 g/mole
B) 0.917 g/mole
C) 22.4 g/mole
D) 20.5 g/mole
Answers
Answer:
M = 20.5 g/mol
Explanation:
Given data:
Volume of gas = 1.20 L
Mass of gas = 1.10 g
Temperature and pressure = standard
Solution:
First of all we will calculate the density.
Formula:
d = mass/ volume
d = 1.10 g/ 1.20 L
d = 0.92 g/L
Now we will calculate the molar mass.
d = PM/RT
0.92 g/L = 1 atm × M / 0.0821 atm.L/mol.K ×273.15 K
M = 0.92 g/L × 0.0821 atm.L/mol.K ×273.15 K / 1 atm
M = 20.5 g/mol
24 grams C convert to moles
Answers
Answer:
Number of moles = 2 mol
Explanation:
Given data:
Mass of carbon = 24 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of carbon is 12 g/mol.
Now we will put the values in formula.
Number of moles = 24 g/ 12 g/mol
Number of moles = 2 mol
True or false: The number of protons an element has can vary.
Answers
Answer:
true
Explanation:
Answer:
Yes
Explanation:
Every element has a unique amount of protons
A student has an unknown mineral. The mass is 59.2 grams and the volume is 8mL. Based on the table, what is the name of the mineral?
A) Magnetite
B) Copper?
C)rutile
D)Galena
Answers
Answer:
D
Explanation:
59.2/8=7.4
What is the charge of a cation?
Answers
Answer:
A cation has more protons than electrons, consequently giving it a net positive charge. For a cation to form, one or more electrons must be lost, typically pulled away by atoms with a stronger affinity for them.
Were i found my answer: Cation vs Anion: Definition, Chart and the Periodic Table
Explanation:
communication from one to another within a cell, like the nerve signal?
Answers
Answer:u just answered your question
Explanation:
Osmosis is a special case of diffusion. Water, like other substances, moves from an area of higher concentration to one of lower concentration. ... In this example, the solute cannot diffuse through the membrane, but the water can. Water has a concentration gradient in this system.!!!!!!!!!!!!!!!!!!!!!!!!!
How are elements labeled on the periodic table that have the same number of
valence electrons?
Answers
Answer:
Explanation:
Elements that have most similar properties were placed in the same group on the periodic table and this is done based on the number of valence electron each of the element posses which allow them reach in a similar manner as a member of the same family. A group of element is placed on a a vertical column of the periodic table.
For all element with one valence electron they are labelled with 1A on the group, and are usually the first column followed by 2A until group 8.
1A element are known to be very reactive and form compounds with similar properties with other elements.
what is lat lakar in sanskrit
Answers
lat lakar means ADDICTION
Note:
Sanskrit was the Indians sacred and classical language. Sanskrit is the language of vedas, Puranas like Bhagavatam, Bhagavadgita.
Cole collects rocks. On a hiking trip, he finds a new rock for his collection. He measures the mass and volume of this rock and uses this chart to identify it the mass of the rock os 16.8 grams and the volume is 6 cubic centimeters what type of rock did cole find
Basalt
granite
limestone
shale
WILL MARK BRAINLEST
Answers
i’ve had the question before and i got granite
Answer:
basalt
Explanation:
you hav a calculater u know
5. Which of the following has variable composition
A. Water
B. sugar
C, soil
D. Salt
Answers
Answer:
C. Soil
Explanation:
The choice with variable composition is the soil. Soil have many different composition.
Soil is made up of minerals, organic matter , water and soil air.Soil minerals are derived from weathered bedrock materials that have been broken down into small pieces. Organic matter is derived from dead and decaying materials from plants and animals. All these materials combine together to form a soil.20 POINTS!! Which of the following is an example of an endothermic chemical reaction?
A. A loaf of bread is cut into slices.
B. A log burns in a fireplace and releases heat and light.
C. A firework explodes in the sky and releases heat and light.
D. A plant absorbs energy from the sun in order to create sugar during photosynthesis.
Answers
Answer:
A, C, D (i think)
Explanation:
Answer:
The answer is D. Phootosynthesis is endothermic.
Explanation:
Please mark me brainliest!!!
How many atoms are in 2.3 moles Au?
Answers
Answer:
6.02×10^23atoms of au
Answer:
i think 3
Explanation:
How many violet photons 7.5 X 10^14 Hz would are necessary to provide the energy of a single AA battery that contains 1300 J?
answer numerically using scientific notation with e and significant figures.
Answers
Answer:
2.6 * 10^21 photons
Explanation:
First we obtain the energy of one photon.
The energy of one photon = hf
h= Planks constant = 6.6 * 10^-34 Js
f = frequency of the radiation = 7.5 X 10^14 Hz
E = 6.6 * 10^-34 * 7.5 X 10^14
E= 49.5 * 10^-20 J
Number of photons = Total energy/ energy of one photon
Total energy = 1300 J
Number of photons = 1300/49.5 * 10^-20
Number of photons = 2.6 * 10^21 photons
A sample of sugar (C12H22O11) contains
1.505 × 1023 molecules of sugar. How many moles of sugar are present in the sample? Answer without doing any calculations.
Answers
Answer: 0.25 mol
Explanation:
Use the formula n=N/NA
n= number of mols
N = number of particles
Nᵃ = Avogadros constant = 6.02 x
So, n=
The 10 to the power of 23 cancels out and you are left with 1.505/6.02, which is approximately 1/4. This is the same as 0.25 mol.
Hope this helped :)
Which of the situations below describes an ethical dilemma related
to food engineering?
A. A fruit-growing company uses a pesticide to protect its pineapples from being eaten before harvest.
B. Organic produce spoils more quickly and is harder to grow because it does not use pesticides.
c. Pesticides protect our crops, but some studies show that they cause consumers to gain weight.
D. Irrigation systems can be used to water large fields of
agricultural crops.
Answers
The situation that describes an ethical dilemma related to food engineering is that pesticides protect our crops, but some studies show that they cause consumers to gain weight and the correct option is option C.
Ethics are the well-grounded standards of right and wrong that dictate what humans ought to do. These are usually put in terms of rights, duties, benefits to the society, fairness, and other specific virtues.
An ethical dilemma is a problem in the decision-making process between two possible options, neither of which is absolutely acceptable from an ethical perspective.
In determining what constitutes an ethical dilemma, it is necessary to make a distinction between ethics, values, morals, and laws and policies.
Thus, the ideal selection is option C.
Learn more about Ethical dilemma, here:
https://brainly.com/question/30401544
#SPJ1
if you increased the mass of planet by 2 what would happen to the gravitational force of the planet
Answers
Answer:
One way to find out is to change “passive mass” - the dirt and rocks of Earth - and convert it into “active mass” - add energy “E” to it. If we increase the energy “E” we will increase its mass. The key is, how do you turn “passive mass” into “active mass” by adding energy “E” to the “passive mass”? After all, isn’t “passive mass” of the Earth just the dirt and rocks that make up the planet?
Explanation:
14.0 J of heat is added to 10.00 g of gold, which is initially at 25°C.
The heat capacity of gold is 25.41 J/(mol • °C).
What would be the final temperature of the gold?
Answers
Answer:
36°C is your answer
Explanation:
use the molar mass to find moles:
(10.00g Au)(1 mole Au/197 grams)= 0.05076 moles of gold
dH= n C dT
14.0 J = (.05076 moles) (25.41 J/mol* degree C) (dT)
dT=10.85 celsius rise in temp
if initially at 25 degrees celsius, a 10.85 celsius rise in temp will bring it to 35.85.
so round that answer and you should get 36 degrees as your answer
(hope this helped :) )
Considering the definition of calorimetry, the final temperature of the gold is 35.85 °C.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In other words, calorimetry is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.
The amount of heat that a body receives or transmits is determined by the following expression:
Q = c×m×ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 14 Jc= 25.41 [tex]\frac{J}{molC}[/tex]m= 10 g×[tex]\frac{1 mol}{197 grams}[/tex]= 0.05076 moles (where 197 [tex]\frac{grams}{mol}[/tex] is the molar mass of gold)ΔT= Tfinal - Tinitial= Tfinal - 25 CThen:
14 J= 25.41 [tex]\frac{J}{molC}[/tex]× 0.05076 moles× (Tfinal - 25 C)
Solving:
[tex]\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} =Tfinal - 25 C[/tex]
[tex]Tfinal=\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} + 25 C[/tex]
Tfinal= 35.85 °C
Finally, the final temperature of the gold is 35.85 °C.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResults
In order for photosynthesis to take place
what must be present?
Answers
Answer:
For photosynthesis to take place, plants need to take in carbon dioxide (from the air), water (from the ground) and light (usually from the sun)
Explanation:
Answer:
water carbon dioxide sunlight and the plant
Explanation:
true or false: The nucleus of an atom contains protons and neutrons.
Answers
Answer:
true
Explanation:
what simple machine is a ramp hammer and a knife
Answers
Answer:
lever Levers
Types of lever
Levers are all around us. Hammers, axes, tongs, knives, screwdrivers, wrenches, scissors—all these things contain levers.
Explanation:
How many moles are in a sample of 4.57x10^24 atoms of neon? 7.59 27.5 91.4 151
Answers
Answer:
The answer is 7.59 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.57 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 7.591362...[/tex]
We have the final answer as
7.59 molesHope this helps you
Answer:
There are exactly 7.59 moles in a sample of 4.57x10^24 atoms of neon
Explanation:
Just took the test
Question 16
Which of the following is an example of a chemical property of matter?
А
reaction with another element
B
density of an element
C
color of an element
D
freezing point of element
Answers
Explanation:
A reaction with another element
other choices are physical property
Answer:
A. reaction with another element
If you somehow managed to isolate a single atom of lithium, how many neutrons would it probably have in its nucleus? Explain.
Answers
Answer:
3 neutrons
Explanation:
Lithium is 3 in the periodic table of elements. This means it has 3 protons usually most elements will have the same number of protons and neutrons in their standard form which you can see in lithium's atomic weight of 6.941.
Please help me!!! For the table that follows, indicate which orbital corresponds to each set of quantum numbers. Ignore x, y, and z subscripts. If the quantum numbers are not allowed (i.e., contain an illegitimate value), indicate that by using the "not allowed" label.
Drag the appropriate labels to their respective targets.
Answers
Answer:
1s
not allowed
3d
not allowed
not allowed
4d
5f
Explanation:
Coefficient = n
l = n-1, where 0=s, 1=p, 2=d, 3=f
ml = -l to +l
The quantum numbers are used to show the arrangement of electrons in orbitals in an atom.
There are four sets of quantum numbers;
Principal quantum number (n)Orbital quantum number (l)Magnetic quantum number (ml)Spin quantum number (ms)Now we are going to assign orbitals to each arrangement of quantum numbers as shown below;
n l ml orbital
1 0 0 1s
3 -3 2 not allowed
3 2 -2 3d
2 0 -1 not allowed
0 0 0 not allowed
4 2 1 4d
5 3 0 5f
We can see that s p d f corresponds to l = 0 1 2 3.
Also note that;
When l = 0 then m= 0
When l= 1, m = -1, 0, 1
When l= 2 m = -2, -1, 0, 1, 2
When l =3 m = -3, -2, -1, 0, 1, 2, 3
Note that n must take positive integer values greater than zero.
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Calculate the molarity of 22.5 g of MgS in 829 mL of solution
Answers
Answer:18652.5
Explanation
