Question

one mole of c₆h₆ weighs 6(12.01 g) + 6(1.01 g) or __________. 78.12 grams 42.3 grams 178.12 grams 7.82 grams question 16 1 pts a mass of 156.24 grams of c₆h₆ is equal to ______ of c₆h₆. 2.00 moles 1.75 moles 0.75 moles 1.00 moles

Explanation:

Step1: Calculate molar - mass of C₆H₆

$6\times12.01+6\times1.01 = 72.06 + 6.06=78.12$ g/mol

Step2: Answer the first question

The molar - mass of C₆H₆ is 78.12 g/mol, so one mole of C₆H₆ weighs 78.12 grams.

Step3: Calculate moles of C₆H₆ in the second question

Use the formula $n=\frac{m}{M}$, where $m = 156.24$ g and $M = 78.12$ g/mol. Then $n=\frac{156.24}{78.12}=2.00$ mol

Answer:

First question: A. 78.12 grams
Second question: A. 2.00 moles