Question

question 1
6 pts
what is the mass of 0.360 mol of hcl?
13.1 g
101 g
2.17×10²³ g
0.360 g
question 2
6 pts
what is the mass of 3.61 mol of cacl₂?
3.61 g
401 g
21.7×10²³ g
21.7 g

Explanation:

Step1: Find molar mass of HCl

The molar mass of H is approximately 1.01 g/mol and Cl is approximately 35.45 g/mol. So molar mass of HCl, $M_{HCl}=1.01 + 35.45=36.46$ g/mol.

Step2: Calculate mass of 0.360 mol of HCl

Use the formula $m = n\times M$, where $n = 0.360$ mol and $M = 36.46$ g/mol. So $m=0.360\times36.46 = 13.1256\approx13.1$ g.

Step3: Find molar mass of $CaCl_2$

The molar mass of Ca is approximately 40.08 g/mol and Cl is approximately 35.45 g/mol. For $CaCl_2$, $M_{CaCl_2}=40.08+2\times35.45=40.08 + 70.9 = 110.98$ g/mol.

Step4: Calculate mass of 3.61 mol of $CaCl_2$

Use the formula $m = n\times M$, where $n = 3.61$ mol and $M = 110.98$ g/mol. So $m=3.61\times110.98 = 400.6378\approx401$ g.

Answer:

Question 1: A. 13.1 g
Question 2: B. 401 g