Question

1. When the temperature of a rigid hollow sphere containing 685 L of helium gas is

Answer 1

Answer:

250.756 moles He

Explanation:

From the question we are given;

Volume, L = 685 L

Temperature, T = 621 K

Pressure, P = 189 × 10 kPa

We are required to calculate the number of moles of the gas,

Using the Ideal gas equation,

PV = nRT, where P is the pressure, V is the volume, T is the temperature, n is the number of moles, and R is the ideal gas constant.

We can replace the known variables and constant in the equation to get the unknown variable, n.

Using ideal gas constant as 8.3145 L.kPa/K/mol

$n=\frac{PV}{RT}$

$n=\frac{(1890)(685)}{(8.3145)(621)}$

$n = 250.7557 moles$

   n = 250.756 moles

The moles of helium contained in the sphere is 250.756 moles