Molecular weights:
CaCl2 = 40 + 35.5*2 = 111 g/mol
Ca3(PO4)2 = 40*3 + (31+16*4)*2 = 310 g/mol
89.3 g CaCl2 = 89.3/111 = 0.8045 mol CaCl2
Balanced equation:
3CaCl2 + 2Na3PO4 --------> 6NaCl + Ca3(PO4)2
3 moles CaCl2 produce 1 mol Ca3(PO4)2
Therefore 0.8045 mol CaCl2 produces 1/3 * 0.8045
= 0.2682 mol Ca3(PO4)2
= 0.2682 mol * 310 g/mol
= 83.1 g Ca3(PO4)2
Ans: 83.1 g
B. Space for the solute and the solvent
In Alfonso's experiment, the speed by which earthworms move is his dependent variable while his independent variable are the degrees of temperature.
He will be changing the degrees of temperature to see how this will affect the speed by which earthworms will be moving.