a beaker contain 40.0 g of calaium carbonate. calculate
(a) molar mass of calcium carbonate.
(b) number of moles of calcium carbonate.
(c) the number of moles of calcium ions in the sample
(d) the number of moles of carbonate ions in the sample
(e) total number of ions in the sample
mole F.4 chem
2009-12-03 7:42 am
回答 (1)
2009-12-03 8:19 am
✔ 最佳答案
(a)Molar mass of CaCO3 = 40 + 12 + 16x3 = 100 g/mol
(b)
No. of moles of CaCO3 = 40/100 = 0.4 mol
(c)
Each moles of CaCO3 contains 1 mol of Ca^2+ and 1 mole of CO3^2-.
No. of moles of Ca^2+ ions = 0.4 mol
(d)
No. of moles of CO3^2- ions = 0.4 mol
(e)
Total no. of moles of ions = 0.4 x 2 = 0.8 mol
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