Problem 68
Asbestos, a known cancer-causing agent, has a typical formula of \(\mathrm{Ca}_{3} \mathrm{Mg}_{5}\left(\mathrm{Si}_{4} \mathrm{O}_{11}\right)_{2}(\mathrm{OH})_{2} .\) How many atoms of each element are given in this formula?
Problem 69
Epsom salts is a hydrate of magnesium sulfate, \(\mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O} .\) What is the formula of the substance that remains when Epsom salts is completely dehydrated?
Problem 70
Rochelle salt is the tetrahydrate of \(\mathrm{KNaC}_{4} \mathrm{H}_{4} \mathrm{O}_{6},\) which means there are four molecules of water per \(\mathrm{KNaC}_{4} \mathrm{H}_{4} \mathrm{O}_{6}\) Write the formula for Rochelle salt.
Problem 77
How many atoms of each element are represented in each of the following formulas? For each, name the elements prescnt. (a) \(\mathrm{K}_{2} \mathrm{C}_{2} \mathrm{O}_{4}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (c) \(\mathrm{C}_{12} \mathrm{H}_{26}\) (d) \(\mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\), (e) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{HPO}_{4}\)
Problem 78
How many atoms of each kind are represented in the following formulas? For each, name the elements present. (a) \(\mathrm{H}_{3} \mathrm{PO}_{4},\) (b) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2}\), (c) \(\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}\) (d) \(\mathrm{Fe}_{3}\left(\mathrm{AsO}_{4}\right)_{2}\) (e) \(\mathrm{C}_{3} \mathrm{H}_{5}(\mathrm{OH})_{3}\)
Problem 79
How many atoms of each kind are represented in the following formulas? For each, name the elements present. (a) \(\mathrm{Ni}\left(\mathrm{ClO}_{4}\right)_{2},\) (b) \(\mathrm{COCl}_{2}\), (c) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (d) \(\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H},\) (e) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{HPO}_{4}\)
Problem 80
How many atoms of each kind are represented in the following formulas? For each, name the elements present. (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{C}_{3} \mathrm{H}_{7}\), (b) \(\mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{KAl}\left(\mathrm{SO}_{4}\right)_{2} \cdot 12 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) (e) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}\)
Problem 81
How many atoms of each element are represented in each of the following expressions? (a) \(7 \mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}\), (b) \(2\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}\) (c) \(5 \mathrm{C}_{3} \mathrm{H}_{5}(\mathrm{OH})_{3}\)
Problem 82
How many atoms of each element are represented in each of the following expressions? (a) \(3 \mathrm{~N}_{2} \mathrm{O},\) (b) \(4\left(\mathrm{CH}_{3}\right)_{2} \mathrm{~S},\) (c) \(2 \mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
Problem 83
Consider the balanced equation $$ 2 \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}+3 \mathrm{Na}_{2} \mathrm{CO}_{3} \longrightarrow \mathrm{Fe}_{2}\left(\mathrm{CO}_{3}\right)_{3}+6 \mathrm{NaNO}_{3} $$ (a) How many atoms of \(\mathrm{Na}\) are on each side of the equation? (b) How many atoms of \(\mathrm{C}\) are on each side of the equation? (c) How many atoms of \(\mathrm{O}\) are on each side of the equation? (d) How many atoms of Fe are on each side of the equation?
