Chapter 3

Calculate the mass in grams of the following. (a) \(1.25 \mathrm{~mol} \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) (b) \(0.600 \mu \mathrm{mol} \mathrm{C}_{4} \mathrm{H}_{10}\) (c) \(0.625 \mathrm{mmol}\) iron(III) nitrate (d) 1.45 mol ammonium carbonate

Calculate the number of moles of each compound in the following samples. (a) \(1.56 \mathrm{ng} \mathrm{NH}_{3}\) (c) \(21.5 \mathrm{~g}\) calcium carbonate (b) \(6.98 \mu \mathrm{g} \mathrm{Na}_{2} \mathrm{CrO}_{4}\) (d) \(16.8 \mathrm{~g}\) strontium nitrate

Calculate the number of moles of each compound in the following samples. (a) \(4.29 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}_{2}\) (c) \(9.36 \mathrm{~g}\) calcium hydroxide (b) \(4.65 \mathrm{mg} \mathrm{NaAuCl}_{4}\) (d) \(38.2 \mathrm{~kg}\) lead \((\mathrm{II})\) sulfate

How many moles of nickel are in \(17.7 \mathrm{~g}\) of \(\mathrm{Ni}\) ?

How many moles of chromium are in \(85.7 \mathrm{~g}\) of \(\mathrm{Cr}\) ?

How many moles of tantalum atoms correspond to \(1.56 \times 10^{21}\) atoms of tantalum?

How many moles of iodine molecules correspond to \(1.80 \times 10^{24}\) molecules of \(\mathrm{I}_{2} ?\)

How many atoms are in \(6.00 \mathrm{~g}\) of carbon-12?

How many atoms are in \(1.50 \mathrm{~mol}\) of carbon-12? How many grams does this much carbon-12 weigh?

Sucrose (table sugar) has the formula \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11} .\) In this compound, what is the (a) atom ratio of \(\mathrm{C}\) to \(\mathrm{H}\) ? (c) atom ratio of \(\mathrm{H}\) to \(\mathrm{O}\) ? (b) mole ratio of \(\mathrm{C}\) to \(\mathrm{O}\) ? (d) mole ratio of \(\mathrm{H}\) to \(\mathrm{O}\) ?