C. Convert the following using the molar mass of each:

i.67 grams of NaCl to moles of NaCl

ii.1.076 moles of H2O to grams of H2O

iii.1.2x104grams of C6H12O6to moles

iv.3.5x10-5moles of Br2to grams Br2

1. 1.145 mole

2. 19.368g

3. 66.67 moles

4. 0.0056g

Explanation:

The following calculations gives the answers to the various questions asked above:

1. Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Mass of NaCl from the question = 67g

Number of mole NaCl =.?

Number of mole = Mass /Molar Mass

Number of mole NaCl = 67/58.5

Number of mole of NaCl = 1.145 mol

2. Number of mole of H2O = 1.076 mole

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O =?

Mass = number of mole x molar Mass

Mass of H2O = 1.076 x 18

Mass of H2O = 19.368g

3. Molar mass of C6H12O6 = (12x6) + (12x1) + (16x6) = 72 + 12 + 96 = 180g/mol

Mass of C6H12O6 = 1.2x104g

Mole of C6H12O6 =.?

Number of mole = Mass /Molar Mass

Mole of C6H12O6 = 1.2x104/180

Mole of C6H12O6 = 66.67 moles

4. Molar mass of Br2 = 2 x 80 = 160g/mol

Mole of Br2 = 3.5x10^-5 moles

Mass of Br2 =?

Mass = number of mole x molar Mass

Mass of Br2 = 3.5x10^-5 x 160

Mass of Br2 = 5.6x10^-3 = 0.0056g

i)  1.15 moles NaCl

ii) 19.39 grams H2O

iii) 66.61 moles C6H12O6

iv)  0.00559 grams Br2

Explanation:

Step 1: data given

Molar mass = mass / moles

i.67 grams of NaCl to moles of NaCl

Moles = mass / molar mass

Moles NaCl = 67 grams / 58.44 g/mol

Moles NaCl = 1.15 moles NaCl

1.076 moles of H2O to grams of H2O

Mass H2O = 1.076 moles * 18.02 g/mol

Mass H2O = 19.39 grams H2O

1.2x104grams of C6H12O6to moles

Moles C6H12O6 = 12000 grams / 180.16 g/mol

Moles C6H12O6 = 66.61 moles C6H12O6

3.5x10-5 moles of Br2 to grams Br2

Mass Br2 = 3.5x10^-5 moles * 159.81 g/mol

Mass Br2 = 0.00559 grams Br2

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.