2 Answers

Dmitriy Apollonin · Answer 1 · 2017-11-07T22:50:36+0000

Answer: The number of moles of gas is 3.89 moles.

Step-by-step explanation:

To calculate the number of moles for given volume, we use the equation given by Avogadro's Law.

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

$V\propto n$ (At constant temperature and pressure)

Or,

(V_1)/(n_1)=(V_2)/(n_2)

where,

$V_1\text{ and }n_1$ are initial volume and number of moles

$V_2\text{ and }n_2$ are final volume and number of moles

We are given:

$V_1=50.5mL\\n_1=2.3mol\\V_2=85.5mL\\n_2=?mol$

Putting values in above equation, we get:

$(50.5mL)/(2.3mol)=(85.5mL)/(n_2)\\\\n_2=3.89mol$

Hence, the number of moles of a gas is 3.89 moles.

Vova Yatsyk · Answer 2 · 2017-11-12T19:32:43+0000

Using the ideal gas equation:
PV = nRT, we can form:
V/n = constant
Thus,
V₁/n₁ = V₂/n₂
n₂ = 2.3 x 85.5/50.5
= 3.89 moles

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