Moles to Particles Conversion?

1) partscoretotalsubmissions1--10/3What is the mass of 4.23 moles of sulfuric acid (H2SO4)?


2) What is the mass of 4.72 10-2 moles of zinc chloride (ZnCl2)?


3) The recommended daily allowance of calcium is 1000 mg of Ca2+ ions. Calcium carbonate is used to supply the calcium in vitamin tablets.


A) How many moles of calcium ions does 1000 mg represent?


B) How many moles of calcium carbonate are needed to supply the required amount of calcium ions?


C) What mass of calcium carbonate must each tablet contain?

Moles to Particles Conversion?
1) H2SO4 molecular weight is 131.3 g/mole


4.23 moles x 131.3 g/mole = 555.4 g





2) ZnCl2 molecular weight is 136.29 g/mole


4.72 moles x 136.29 g/moles = 643.29 g





3) 1000mg = 1 g Ca


a) 1 g Ca2+ /40.08 g/mole = 0.025 moles Ca ions


b) 0.025 moles CaCO3 are needed (since there's one mole of Ca2+ in each mole of CaCO3 molecule.


CaCO3 moleclular weight is 100.08 g/mole


c) each tablet would contain 0.025 moles x 100.08 g/mole = 2.5 grams of Ca CO3