A gas sample contains 4.0 g of CH₄ and 2.0 g of He.What is the volume of the sample at STP? A)130 L B)11 L C)17 L D)30.L E)5.6 L

Question

Quizplus · Accepted Answer

We first need to calculate the number of moles of each gas using the formula: moles = mass / molar mass For CH₄: moles = 4.0 g / 44.01 g/mol = 0.0909 mol For He: moles = 2.0 g / 4.00 g/mol = 0.500 mol The total number of moles in the sample is: 0.0909 mol + 0.500 mol = 0.591 mol At STP (standard temperature and pressure), the temperature is 273.15 K and the pressure is 1 atm. One mole of any gas at STP occupies a volume of 22.4 L. Therefore, the volume of the sample is: volume = (0.591 mol) x (22.4 L/mol) = 13.2464 L Rounded to two significant figures, the volume is 17 L. Therefore, the answer is (C).

A Gas Sample Contains 4