Question

Apply the ideal gas law (pv=nRT) to the following situation. How many moles

of gas do I have, if there are 30 L of gas at 0.7 atm of pressure and the
temperature is 315 K? (Remember that the gas law constant = 0.0817 L atm/mol
K) *
A. 0.82 mol of gas
B. 0.0054 mol of gas
C. 82 mol of gas
D. 54 mol of gas

Answer 1

It has 0.82 moles of gas

Step-by-step explanation:

Given:

The Volume of gas = 30 L

The pressure of the gas = 0.7 atm

Temperature =315 K

To Find:

Number of moles of the gas = ?

Solution:

According to Ideal gas law

PV =nRT

where

P is the pressure

V is the volume

T is the temperature

n is the number of moles

R is the gas law constant

On substituting the given values in the formula, we get

(0.7) (30) = n (0.0817)(315)

21 = n (25.7355)

n = \frac{21}{25.7355}

n= 0.8159

n = 0.82(rounding off)