Find the mass, in grams, for the given number of molecules of a compound whose molar mass is given. Round your answer to the nearest hundredth of a gram.
-$1.93 \times 10^{22}$ molecules of calcium nitrate $\left(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\right)$; molar mass 164.10 grams
A) 5.26 grams
B) 1.18 grams
C) 0.03 grams
D) 316.71 grams

Question

Quizplus · Accepted Answer

To find the mass, use the formula: mass = (number of molecules / Avogadro's number) * molar mass. Avogadro's number is $6.022 \times 10^{23}$ molecules/mol. So, mass = $(1.93 \times 10^{22} / 6.022 \times 10^{23}) \times 164.10 \approx 5.26$ grams.

Find the Mass, in Grams, for the Given Number of Molecules