Chemistry: Which of these changes would cause a decrease in the pressure of a contained gas?

Which of these changes would cause a decrease in the

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17.01.2023

22.39 grams.

Explanation

How many moles of CaCl₂ in that solution?

$c = 0.40 \; \text{M} = 0.40 \; \text{mol}\cdot \textbf{L}^{-1}$ ;

$V = 504.3 \; \textbf{ml} = 0.5043 \; \textbf{L}$ ;

$n = c \cdot V = 0.40 \; \text{mol}\cdot \textbf{L}^{-1} \times 0.5043 \; \textbf{L}= 0.20172 \; \text{mol}$ .

What's the mass of that 0.20172 moles of CaCl₂?

Molar mass from a modern periodic table:

Ca- 40.078;Cl- 35.45.

Molar mass of CaCl₂:

$M(\text{CaCl}_2) = 40.078 + 2 \times 35.45 = 110.978 \; \text{g}\cdot \text{mol}^{-1}$ .

Mass of that 0.20172 moles of CaCl₂:

$m = n \cdot M = 0.20172 \times 110.978 = 22.39 \; \text{g}$ .

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