Question

read the ck - 12 lesson below (also watching the videos inserted), then answer the following questions. 10.3 molar mass 1.) the molar mass of iron is ____ (1 point) 55.85 g/mol 19.00 g/mol 126.90 g/mol 2.) oil of vitriol is a substance that humankind has known of for thousands of years. today the substance is sulfuric acid and has the molecular formula h₂so₄. what is the molar mass of h₂so₄? (1 point) 98.08 g/mol 223.14 g/mol 73.29 g/mol 148.72 g/mol

Explanation:

Step1: Recall molar - mass concept

Molar mass is the mass of one mole of a substance, numerically equal to the atomic or molecular weight in g/mol.

Step2: Find molar mass of iron

The atomic number of iron (Fe) is 26. Its molar mass is approximately 55.85 g/mol.

Step3: Calculate molar mass of H₂SO₄

The molar mass of H is approximately 1.01 g/mol, S is approximately 32.07 g/mol, and O is approximately 16.00 g/mol. For H₂SO₄, molar mass = 2×1.01 + 32.07+4×16.00 = 2.02+32.07 + 64.00=98.09 g/mol (close to 98.08 g/mol considering rounding - off differences).

Answer:

1. A. 55.85 g/mol
2. A. 98.08 g/mol