Question

How many moles are in a balloon that is 50.2L, 755 mmHg and -22.0C?

Answer 1

Answer:

n ≈ 2.42 moles

General Formulas and Concepts:

Chem

Ideal Gas Law: PV = nRT

• P is pressure in mmHg
• V is volume in liters
• n is number of moles
• R is a constant (62.4 L · mmHg/mol · k)
• T is temperature in Kelvins

K = °C + 273

Explanation:

Step 1: Define

V = 50.2 L

P = 755 mmHg

T = -22.0°C = 251 K

Step 2: Find moles n

(755 mmHg)(50.2 L) = n(62.4 L · mmHg/mol · k)(251 K)

37901 mmHg · L = n(15662.4 L · mmHg/mol)

n = 2.41987 moles

Step 3: Check

We are given 3 sig figs. Follow sig fig rules.

2.41987 moles ≈ 2.42 moles