I don’t have the original questions with me, but make sure the equation is balanced before the ratios are set.
5) a. 5 moles of Li3PO4(3 HF/1 Li3PO4) = 15 moles HF
b. 9.8 g/(98g/mole) = 0.10 moles H3PO4
0.10 moles H3PO4(3
LiF/1 H3PO4) = 0.30 moles LiF
c. 1 mole LiF (1 H3PO4/3 LiF) = 0.33 moles H3PO4
0.33 moles H3PO4(98g/mole) = 32.7 g
d. 200g HF/(20g/mole) = 10 moles HF
10 moles HF(3LiF/3HF) = 10 moles LiF
10 moles LiF (26 g/mole) = 260 g