Question

how many grams constitutes 3.00 moles of co₂?
132 g
84.0 g
168 g
14.7 g
question 12
1 pts
how many moles in 32.0 g of ch₄?
128 mole
0.502 mol
1.99 mol
514 mol

Explanation:

Step1: Calculate molar mass of CO₂

The molar mass of C is 12.01 g/mol and O is 16.00 g/mol. For CO₂, molar mass $M = 12.01+2\times16.00=44.01$ g/mol.

Step2: Calculate mass of 3.00 moles of CO₂

Using the formula $m = n\times M$, where $n = 3.00$ mol and $M = 44.01$ g/mol. So $m=3.00\times44.01 = 132.03\approx132$ g.

Step3: Calculate molar mass of CH₄

The molar mass of C is 12.01 g/mol and H is 1.01 g/mol. For CH₄, molar mass $M'=12.01 + 4\times1.01=16.05$ g/mol.

Step4: Calculate moles of 32.0 g of CH₄

Using the formula $n'=\frac{m'}{M'}$, where $m' = 32.0$ g and $M'=16.05$ g/mol. So $n'=\frac{32.0}{16.05}\approx1.99$ mol.

Answer:

First question: A. 132 g
Second question: C. 1.99 mol