Scan_Doc0013 - 106 Chapter Three Stoichiometry 2 ~ What are...

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106 Chapter Three Stoichiometry 2 ~ What are the moles of LiOH? To find the moles of LiOH, we need to know the molar mass. What is the molar mass for LiOH? 6.941 + 16.00 + 1.008 = 23.95 glmol Now we use the molar mass to find the moles of LiOH: 1000 g..biEm 1mol LiOH = 41.8 mol LiOH 1.00 kg.bifflt X 1 kg.bifflt X 23.95 g..biEm 3~ What is the mole ratio between CO 2 and LiOH in the balanced equation? 1mol CO 2 2 mol LiOH 4 ~ What are the moles of CO 2 ? 1mol CO 2 41.8 rool:-bett X 2 rool:-bett = 20.9 mol CO 2 5 ~ What is the mass ofC02formedfrom 1.00 kg LiOH? 44.0 gC0 2 2 20.9~ X = 9.20 X 10 gC0 2 1mel-e0 2 • Thus 920. g of COig) will be absorbed by 1.00 kg of LiOH(s). SEE EXERCISES 3.99 AND 3.100 EXAMPLE 3.16 . Baking soda (NaHC0 3 ) is often used as an antacid. It neutralizes excess hydrochloric acid
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Unformatted text preview: acid secreted by the stomach: NaHC0 3 (s) + HCI(aq) ~ NaCl(aq) + H 2 0(l) + CO 2 (aq) Milk of magnesia, which is an aqueous suspension of magnesium hydroxide, is also used as an antacid: Mg(OH)is) + 2HCI(aq) ~ 2H 2 0(I) + MgCI 2 (aq) Which is the more effective antacid per gram, NaHC0 3 or Mg(OH)2? Solution Where are we going? • To compare the acid neutralizing power of NaHC0 3 and Mg(OH)2 per gram What do we know? ./ Balanced equations for the reactions ./ l.00 g NaHC0 3 ./ l.00 g Mg(OH)2 How do we get there? For NaHC0 3 1 ~ What is the balanced equation? NaHC0 3 (s) + HCI(aq) ~ NaCI(aq) + H 2 0(l) + CO 2 (aq)...
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