Question

1. use your scratch paper to draw out the rr track for this problem: how many grams is 1.28 moles of calcium (ca)? round to the tenths place.

Explanation:

Step1: Recall molar mass of Ca

Molar mass of Ca is 40.08 g/mol (from periodic table).

Step2: Use moles to grams formula

Grams = moles × molar mass. So, grams = \(1.28 \, \text{mol} \times 40.08 \, \text{g/mol}\).

Step3: Calculate the product

\(1.28 \times 40.08 = 51.3024\) g.

Step4: Round to tenths place

Rounding 51.3024 to tenths place gives 51.3 g.

Answer:

51.3 grams