Correct answers only please

Answer:

https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:linear-equations-graphs/x2f8bb11595b61c86:slope/v/graph-from-point-slope. Answer 1

Explanation:

I only know the first one

The mole fraction of oxygen in this mixture is = 0.5789  which is not listed  in the options. while the mole fraction of carbon dioxide = 0.4211 ( A )

Given that :

Mass of carbon dioxide = mass of oxygen

lets assume the given mass  = x

first step : determine the moles of CO₂ and O₂

moles of CO₂ = mass / molar mass of CO₂

                       = x / 44

moles of O₂  =  mass / molar mass of O2

                     = x / 32

∴ mole fraction of O₂ = moles of O₂ / ( Total moles in the mixture )

                                   = [tex]\frac{x}{32} / ( \frac{x}{44} + \frac{x}{32} )[/tex]

                                   = [tex]\frac{44*32*(x)}{32 * 76 *(x)}[/tex]  = 0.5789

While the mole fraction of Carbon dioxide = 1 - 0.5789 = 0.4211

hence the mole fraction of oxygen in this mixture = 0.5789 while the mole fraction of Carbon dioxide = 0.4211

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Compounds are made of more than one element hence water is made of 2 Hydrogen and one Oxygen, but nacent Hydrogen is single hence it is an element.

Answer:

5H²O= 23

ZnCl²=135

have a great day

Answer:

it would take 2 years

Explanation:

93/55=1.69--->1.70------>2

Answer:

3 ZnBr2(aq) + 2Al (s) ====>2AlBr3 (aq) + 3 Zn(s),

Answer: 60.2g

Explanation:

One mole acetic acid weighs 60.2g

Answer:

id answer but you only put the points at "5"

Explanation:

soooo......sorry.....

not

hehe

Answer:

6)

a). 5.6 × 10⁵

b) 3.34 × 10⁴

c) 4.12 × 10_⁴

Answer:

Conductivity

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 1.87 \J/g \textdegree C}}[/tex]

Explanation:

We are asked to find the specific heat capacity of a liquid. We are given the heat added, the mass, and the change in temperature, so we will use the following formula.

[tex]q= mc\Delta T[/tex]

The heat added (q) is 47.1 Joules. The mass (m) of the liquid is 14.0 grams. The specific heat (c) is unknown. The change in temperature (ΔT) is 1.80 °C.

Substitute these values into the formula.

[tex]47.1 \ J = (14.0 \ g) * c * (1.80 \textdegree C)[/tex]

Multiply the 2 numbers in parentheses on the right side of the equation.

[tex]47.1 \ J = (14.0 \ g * 1.80 \textdegree C)*c[/tex]

[tex]47.1 \ J = (25.2 \ g*\textdegree C) *c[/tex]

We are solving for the heat capacity of the liquid, so we must isolate the variable c. It is being multiplied by 25.2 grams * degrees Celsius. The inverse operation of multiplication is division, so we divide both sides of the equation by (25.2 g * °C).

[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} = \frac {(25.2 g *\textdegree C)*c}{{(25.2 g *\textdegree C)}}[/tex]

[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} =c[/tex]

[tex]1.869047619 \ J/g *\textdegree C = c[/tex]

The original measurements of heat, mass, and temperature all have 3 significant figures, so our answer must have the same. For the number we found that is the hundredth place. The 9 in the thousandth place to the right tells us to round the 6 up to a 7.

[tex]1.87 \ J/ g * \textdegree C =c[/tex]

The heat capacity of the liquid is approximately 1.87 J/g°C.

Consider the balanced reaction,

N₂ + 3 H₂   ⇒   2 NH₃

which says that 1 mole of nitrogen gas combines with 3 moles of hydrogen gas to produce 2 moles of ammonia gas.

Look up the molar masses of each element:

• N has a molar mass of 14.007 g/mol

• H has a molar mass of 1.008 g/mol

Then the reaction starts with

• (35.6 g) (1/28.014 mol/g) ≈ 1.27 mol N₂

• (7.69 g) (1/2.016 mol/g) ≈ 3.81 mol H₂

which means we have nearly exactly 3 times as many moles of H₂ as we do of N₂. These will combine to make 2 * 1.27 = 2.54 moles of NH₃, which has a molar mass of 17.031 g/mol, and so the reaction produces

(2.54 mol) (17.031 g/mol) ≈ 43.3 g NH₃

Answer:

Silicon

Explanation:

Therefore the isotope with 14 protons and 15 neutrons is Silicon-29.

An atom has 15 protons and 14 Neutrons. The atomic number of this atom is 14 and the element is silicon.

The atomic number of an element is its total number of protons or the total number of electrons. The atomic number is written down the element. It can be calculated by knowing the numbers of protons and electrons.

The element here is silicon, whose number of protons, electrons, and neutrons are equal, which is 14. These are the charged particles that are present in the atoms of the element.

The number of band protons is equal to an element. The atomic number will be its number of protons. The isotope with 14 protons and 15 neutrons is Silicon-29.

Thus, the atomic number of the element is 14 if it has 15 protons and 14 Neutrons. The element is silicon.

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Explanation:

Alcohol burning

hope this helps you

Answer:s  its  a mixture

Explanation:

Answer:

I honestly have no  clue

Explanation:

Answer: Carbon, hydrogen oxygen

Explanation:C2H5OH

Answer:

false

Explanation:

false

Hello!

Answer:

Hydrogen

Explanation:

Hydrogen (H) has one electron in its outermost shell, but it is not classed as an alkali metal since it is not a metal but a gas at room temperature.

Answer:

hydrogen, lithium, sodium element are not alkali metal

Answer:

Prudent execution of experiments requires not only sound judgment and an accurate assessment of the risks involved in the laboratory, but also the selection of appropriate work practices to reduce risk and protect the health and safety of trained laboratory personnel as well as the public and the environment. Chapter 4 provides specific guidelines for evaluating the hazards and assessing the risks associated with laboratory chemicals, equipment, and operations. Chapter 5 demonstrates how to control those risks when managing the inventory of chemicals in the laboratory. The use of the protocols outlined in Chapter 4 in carefully planned experiments is the subject of this chapter.

Explanation:

The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Thus the pOH of 0.04 M HCl is  12.6. pH is a unitless quantity. The correct option is option C.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

The concentration of HCl is 0.04 M

Concentration of H₃O⁺=0.04 M

Mathematically,

pH=-log[H⁺]

Substituting the values

pH=-log[0.04 M]

     = 1.4

pOH = 14-pH = 12.6

Thus  the pOH of 0.04 M HCl is  12.6. The correct option is option C.

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Answer:

58

Explanation:

mass number of iron 58 is 58

Molecular Mass of water:-

[tex]\\ \sf\longmapsto H_2O[/tex]

[tex]\\ \sf\longmapsto 2(1u)+16u[/tex]

[tex]\\ \sf\longmapsto 2u+16u[/tex]

[tex]\\ \sf\longmapsto 18u[/tex]

[tex]\\ \sf\longmapsto 18g[/tex]

1mole of water weighs 18g

We know

[tex]\\ \sf\longmapsto 1mol=6.023\times 10^23molecules[/tex]

Mass of one molecule:-

[tex]\\ \sf\longmapsto \dfrac{18}{6.023\times 10^23}[/tex]

[tex]\\ \sf\longmapsto 2.98\times 10^24g[/tex]

Answer:

0.44mol

Explanation:

1mol/102g=xmol/45.1g

-> x=(45.1x1)/102

x=0.44mol

Answer:

Dosage of drugs is dependent on the body weight of a person. The route of administration also plays crucial role in determining the dosage of the drugs. The calculation of dosage of drugs based on the bodyweight is calculated by the multiplication of body weight and dosage.

Explanation:

The medication dosage is given as 45mg/kg. To calculate the mass of dosage a child will require of body weight 33.5lb will be:

[tex]\text{Dose} = \text{Body weight} \times \text{Dosage}[/tex]  

Therefore, converting the pounds to kg, it will be:

[tex]33.5\;\text{lb} = 15.19\;\text{ kg} \;(1\;\text{lb} = 0.4\;\text{ kg})[/tex]

Thus, dose of medication required will be:

[tex]\text{Dose} = 15.19 \: \times \: 45[/tex]

[tex]\text { Dose} = 683.8\: \text { mg}[/tex]

Answer:  8556 mm, or 855.6 cm (8560 mm to 3 sig figs)

Explanation:  Convert mm to cm by dividing by 10 (1cm/10mm)

Find the area of the foil face in cm^2 (30cm*0.2020cm) = 0.606 cm^2

Calculate the volume occupied by 1.40 kg of foil in cm^3.  1.40kg = 1400g

1.400g/(2.7 g/cm^3) = 518.5 cm^3 for 1.40 kg Au

   Volume = Area (of the face) * Length  

We want Length:

Length = Volume/Area

L = (518.5 cm^3/0.606 cm^2)

L = 855.6 cm (8556 mm)  Round to 3 sig figs (856 cm and 8560 mm)

Answer

 I think a helicopter would be fastest, just sayin.

Explanation: