Question

if the molar mass of a substance is 18 g/mol, how many grams are in 3 moles?
a. 6 grams
b. 18 grams
c. 54 grams
d. 36 grams

Explanation:

Step1: Recall the formula for mass calculation

The formula for mass \(m\) is \(m = n\times M\), where \(n\) is the number of moles and \(M\) is the molar mass.

Step2: Substitute the given values

Given \(n = 3\space mol\) and \(M=18\space g/mol\). Then \(m=3\times18\).

Step3: Calculate the result

\(m = 3\times18=54\space g\)

Answer:

C. 54 grams