Question

If you have a gas with a volume of 45 L, pressure of 1.01 atm, and a temperature of 25 degrees Celsius what is the amount of gas you have? Answer with 3 significant figures and no units.

Answer 1

Step-by-step explanation:

Comment

You have to look around for the best R to use. The problem is that R has different values depending on what the units of the givens are. In this case you have

Givens

V = 45 L

P = 1.01 atmospheres

T = 25 degrees = 25oC + 273 kelvin = 298 degrees kelvin

R = 0.08206 for those givens.

Equation

PV = n * R * T

Solve

1.01 * 45 = n * 0.08206 * 278

n = (1.01 * 45) / (0.08206*278)

n = 1.99