(Solved): Exercises on Interconversion of moles, mass, and number of particles 1 How many moles of \( \mathr ...

Exercises on Interconversion of moles, mass, and number of particles 1 How many moles of \( \mathrm{NaOH}(\mathrm{FW}=40 \mathrm{~g} / \mathrm{mol}) \) are there in \( 2.0 \) grams \( \mathrm{NaOH} \) ? 2 How many grams of \( \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{FW}=106 \mathrm{~g} / \mathrm{mol} 0 \) are there in \( 0.50 \) moles \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) ? 3 How many particles of \( \mathrm{H}_{2} \mathrm{O}(\mathrm{FW}=18 \mathrm{~g} / \mathrm{mol}) \) are there in \( 1.8 \mathrm{grams} \) of \( \mathrm{H}_{2} \mathrm{O} \) ? 4 How much does \( 6.02 \times 10^{23} \) molecules of \( \mathrm{CO}_{2}(\mathrm{FW}=44 \mathrm{~g} / \mathrm{mol}) \) weigh? 5 How many moles of nitrate are there in \( 2.0 \) moles of \( \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3} \) ? 6 How many grams of nitrate are there in \( 2.0 \) moles \( \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3} \) ? 7 Calculate the formula weight of water. 8 What is the percentage composition of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) ? 9 Determine the empirical formula of the compound containing \( 87.5 \% \) nitrogen and \( 12.5 \% \mathrm{H} \) by mass. 10 What is the molecular formula of the compound if its empirical formula is \( \mathrm{HCO}_{2} \) and its molecular weight is \( 90.0 \) amu?