Question

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

Answer 1

Answer:

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

Answer 2

Answer:

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