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
