Question

1. convert 15.8 moles of calcium to grams.

Explanation:

Step1: Find the molar mass of calcium

The molar mass of calcium ($Ca$) is $40.08\ g/mol$.

Step2: Use the formula $m = n\times M$

Here, $n = 15.8\ mol$ (number of moles) and $M=40.08\ g/mol$ (molar mass). Then $m=15.8\times40.08$.
$$m = 15.8\times40.08=633.264\ g$$

Answer:

$633.264\ g$