Question

1. how many moles of ca is 100g of ca?

Explanation:

Step1: Recall the formula for moles

The formula to calculate moles ($n$) is $n = \frac{m}{M}$, where $m$ is the mass of the substance (in grams) and $M$ is the molar mass of the substance (in g/mol).

Step2: Determine the molar mass of Ca

The molar mass of calcium (Ca) is approximately 40.08 g/mol (from the periodic table).

Step3: Calculate the moles of Ca

Given $m = 100$ g and $M = 40.08$ g/mol, substitute into the formula: $n=\frac{100\ \text{g}}{40.08\ \text{g/mol}}\approx 2.495$ mol.

Answer:

Approximately 2.50 moles (or more precisely, approximately 2.495 moles)