Some questions will give you an amount of moles and ask you to determine the mass
Converting Moles to mass only requires one additional step
Examples:
1)Moles to Grams:
2)Grams to Moles:
Examples:
How many grams of water are produced if 0.84 mol of Phosphorite Acid is completely neutralized by Barium Hydroxide.
- 2H3PO4 + 3Ba(OH)2 → 6H2O + Ba3(PO4)2
- 0.84 mol H3PO4 x 6H2O/ 2H3PO4 = 2.52 mol H2O
- 2.52 H2O x 18.02g/ 1 H20 =45.36→ 45g
Example 2:
How many moles of Lead(II) Nitrate are consumed when 4.5g of Sodium Sulphide completely reacts?
- Pb(NO3)2 + 1 Mol Na2S → 1PbS + 2Na(NO3)
- 4.5g Na2S x 1 Pb(NO3)2/ 78.1g Na2S = 0.0576 mol Pb(NO3)2
- 0.0576 mol x 1 Pb(NO3)2/ 1 Mol Na2S= 0.0576 mol Pb(NO3)2
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