Question

what is the mass of 5.7 mol of nh3?
molar mass nh3 = 17.04 g/mol
5.7 mol nh3 = ? g nh3

Explanation:

Step1: Use the formula \(m = n\times M\)

Where \(m\) is mass, \(n\) is amount of substance (in moles), and \(M\) is molar mass. Here, \(n = 5.7\space mol\) and \(M=17.04\space g/mol\).

Step2: Substitute the values into the formula

\(m=5.7\space mol\times17.04\space g/mol\)
\(m = 5.7\times17.04\space g\)
\(m=97.128\space g\approx97\space g\) (rounded to two significant figures as 5.7 has two significant figures)

Answer:

\(97\space g\)