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1 month ago

What is the mass of 2.15 liters of N2 gas at STP?

Chemistry

1 answer:

alisha [2.8K]1 month ago

6 0

Answer:

2.68 g

Explanation:

Given:

Volume of gas at STP = 2.15 L

Unknown:

Mass of nitrogen (N₂) gas at STP

Solution:

We will apply the mole concept to find the mass:

Step 1: Calculate moles of nitrogen gas at STP:

Number of moles = $\frac{volume occupied}{22.4dm^{3} mol^{-1} }$

Note: 1 L = 1 dm³

Step 2: Use moles and molar mass to find mass:

Mass = moles × molar mass

Calculations:

1. Number of moles of N₂ = $\frac{2.15}{22.4}$

Number of moles of N₂ = 0.096 mole

2. Given atomic mass of N = 14 g

Molar mass of N₂ = 2 × 14 = 28 g/mol

Mass = 0.096 mol × 28 g/mol = 2.68 g

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