Calculate the mass in grams of the following:
1. mass in g of B2 in 10g of B2O3
2. mass in g of B4 in 20g of Na2B4O7
3. mass in g of O4 in 8g of Mn3O4
4. mass in g of O4 in 15g of CaC2O4
1. First, calculate the molar mass of B2O3:
B = 10.81 g/mol
O = 16.00 g/mol
Molar mass of B2O3 = 2(10.81) + 3(16.00) = 46.63 g/mol
Now, calculate the mass of B2 in 10g of B2O3:
(2 x 10.81 g/mol) / 46.63 g/mol x 10g = 4.34g
2. First, calculate the molar mass of Na2B4O7:
Na = 22.99 g/mol
B = 10.81 g/mol
O = 16.00 g/mol
Molar mass of Na2B4O7 = 2(22.99) + 4(10.81) + 7(16.00) = 201.07 g/mol
Now, calculate the mass of B4 in 20g of Na2B4O7:
(4 x 10.81 g/mol) / 201.07 g/mol x 20g = 4.29g
3. First, calculate the molar mass of Mn3O4:
Mn = 54.94 g/mol
O = 16.00 g/mol
Molar mass of Mn3O4 = 3(54.94) + 4(16.00) = 228.76 g/mol
Now, calculate the mass of O4 in 8g of Mn3O4:
(4 x 16.00 g/mol) / 228.76 g/mol x 8g = 0.56g
4. First, calculate the molar mass of CaC2O4:
Ca = 40.08 g/mol
C = 12.01 g/mol
O = 16.00 g/mol
Molar mass of CaC2O4 = 40.08 + 2(12.01) + 4(16.00) = 124.10 g/mol
Now, calculate the mass of O4 in 15g of CaC2O4:
(4 x 16.00 g/mol) / 124.10 g/mol x 15g = 1.94g