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3 years ago

2. CHECK ALL THAT APPLY: Select the question(s) that will involve molar mass.

Chemistry

1 answer:

ASHA 777 [7]3 years ago

6 0

Answer:

A substance consisting of 3.7 grams of beryllium fluoride would be equal to how many moles of beryllium fluoride?

How many grams of sodium are equal to 1.5 moles of sodium?

Explanation:

The molar mass is related to number of moles and mass of an element or compound.

Using the expression:

Number of moles = $\frac{mass}{molar mass}$

For any problem, where the number of moles is known, we can find the mass.

A substance consisting of 3.7 grams of beryllium fluoride would be equal to how many moles of beryllium fluoride?

Here we know the mass, we simply use the molar mass to find the number of moles.

How many grams of sodium are equal to 1.5 moles of sodium?

Here number of moles is given, we use the molar mass to find the mass of the sodium given

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Boyle's law states that gas volume is Boyle's law states that gas volume is inversely proportional to temperature. directly prop

ankoles [38]

<u>Answer:</u> Boyle's law states that gas volume is inversely proportional to pressure.

<u>Explanation:</u>

Boyle's law is one of the law used to determine the Ideal Gas equation.

This law states that pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles

Mathematically,

$P\propto \frac{1}{V}$ (at constant temperature and number of moles)

The above expression can also be written as:

$P_1V_1=P_2V_2$

where,

$P_1\text{ and }V_1$ are initial pressure and volume of the gas

$P_2\text{ and }V_2$ are final pressure and volume of the gas

Hence, Boyle's law states that gas volume is inversely proportional to pressure.

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3 years ago

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3 years ago

The cylinder of aluminum in class was approximately 13mm in circumference and 42mm in length. What would be it's approximate mas

Roman55 [17]

Answer:

Mass, m = 1.51 grams

Explanation:

It is given that,

The circumference of Aluminium cylinder, C = 13 mm = 1.3 cm

Length of the cylinder, h = 4.2 cm

We know that the density of the Aluminium is 2.7 g/cm³

Circumference, C = 2πr

$r=\dfrac{C}{2\pi}\\\\r=\dfrac{1.3}{2\pi}\\\\r=0.206\ cm$

Density is equal to mass per unit volume.

$d=\dfrac{m}{V}$

m is mass of the cylinder

V is the volume of the cylinder

$V=\pi r^2h\\\\V=\dfrac{22}{7}\times0.206^2\times 4.2\\\\V=0.5601\ cm^3$

So,

$m=d\times V\\\\m=2.7\times 0.5601\\\\m=1.51\ g$

So, the mass of the cylinder is 1.51 grams.

5 0

4 years ago

How does changing the concentration of the reactants change the parts of a rate law? It changes the rate, R. It changes the rate

Sidana [21]

Answer

A. It changes the rate, R

Explanation

When we change the concentration of the reactants in a chemical reaction, it affects the rate of reaction that happens in the process. Typically, the rate of reaction will decrease with time if the concentration of the reactants decreases because the reactants will be converted to products. Similarly, the rate of reaction will increase when the concentration of reactants are increased.

4 0

3 years ago

Pressure is this sample?

faltersainse [42]

Answer:

P = 164 Atm

Explanation:

PV = nRT => P = nRT/V

n = 10.0 moles

R = 0.08206 L·Atm/mol·K

T = 27.0°C = 300 K

V = 1.50 Liters

P = (10.0 mol)(0.08206 L·Atm/mol·K )(300 K)/(1.50 Liters) = 164.12 Atm ≅ 164 Atm (3 sig. figs.)

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3 years ago