Chapter 3: Q 35E (page 169)
Question-Determine the percent ammonia (NH3) in Co (NH3)6Cl3 to three significant figures.
The percent ammonia in Co (NH3)6Cl3 is 38.2%.
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Question: There is about 1.0g of calcium, as Ca2+, in 1.0 L of milk. What is the molarity of Ca2+ in milk?
Determine the mass of each of the following:
(a) 0.0146 mol KOH
(b) 10.2 mol ethane, C2H6
(c) 1.6×10−3 mol Na2SO4
(d) 6.854×103 mol glucose, C6 H12 O6
(e) 2.86 mol Co(NH3)6Cl3
Calculate the following to four significant figures:
(a) the percent composition of ammonia, \({\rm{N}}{{\rm{H}}_3}\)
(b) the percent composition of photographic fixer solution (“hypo”), \({\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}\)
(c) the percent of calcium ion in \({\rm{C}}{{\rm{a}}_3}{{\rm{(P}}{{\rm{O}}_4}{\rm{)}}_2}\)
A 55-kg woman has 7.5 × 10−3 mol of hemoglobin (molar mass = 64,456 g/mol) in her blood. How many hemoglobin molecules is this? What is this quantity in grams?
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