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. (5 points) How many moles of oxygen are necessary to completely react with propane
(C3H8) to produce 16.3 mol of water according to the following balanced chemical
equation? ________________________________________________________________________
C3H8 + 5 O2  3 CO2 + 4 H2O
7. (10 points) What mass of barium hydroxide is necessary to react with 253 g of
phosphoric acid (H3PO4) according to the following balanced chemical equation?
____________________________________________________________________________________
2 H3PO4 + 3 Ba(OH)2  Ba3(PO4)2 + 6 H2O
8. (5 points) What volume of carbon dioxide (CO2) gets produced when 8.0 L of octane
(C8H18) react with excess oxygen according to the following balanced chemical
equation? _________________________________________________________________________
2 C8H18 + 25 O2  16 CO2 + 18 H2O

Respuesta :

MissPhiladelphia
Solve each number by dimensional analysis:

6.) 16.3 mol H2O x (5 mol O2 / 4 mol H2O ) = 20.38 mol O2

7.) 253 g H3PO4 (1 mol H3PO4 / 98 g H3PO4) x (3 mol Ba(OH)2 / 2 mol H3PO4) x (171 g Ba(OH)2 / 1 mol Ba(OH)2 = 662 g Ba(OH)2

8.) Assume the same conditions of CO2 and octane
8 L octane x (12 L CO2 / 2 L octane) = 48 L CO2

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