Problem

Problem

A mixture of 4 g of hydrogen and 8 g of helium at NTP has a density about a. 0.22 kg/m30.22 \text{ kg/m}^3 b. 0.62 kg/m30.62 \text{ kg/m}^3 c. 1.12 kg/m31.12 \text{ kg/m}^3 d. 0.13 kg/m30.13 \text{ kg/m}^3
Intuitive explanation

The key is recognizing that density depends on both mass and volume, and at the same conditions (NTP), equal moles of any ideal gas occupy the same volume. Calculate moles of each gas using their molar masses, find the total moles to get the volume, then divide total mass by that volume. The "mixture" part just means you're combining two different gases, but they follow the same ideal gas law.

Intuitive explanation

The key is recognizing that density depends on both mass and volume, and at the same conditions (NTP), equal moles of any ideal gas occupy the same volume. Calculate moles of each gas using their molar masses, find the total moles to get the volume, then divide total mass by that volume. The "mixture" part just means you're combining two different gases, but they follow the same ideal gas law.

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