
CHM 1045 Limiting
Authored by Marianna S. Palma
Science
University
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6 questions
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1.
FILL IN THE BLANK QUESTION
5 mins • 1 pt
When octane (C8H18 ) is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water. What mass of octane is consumed by the reaction of 8.7g of oxygen gas?
Round your answer to 2 significant digits.
2.
FILL IN THE BLANK QUESTION
10 mins • 1 pt
Ammonium phosphate ((NH4 )3PO4) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H3PO4) with ammonia. What mass of ammonium phosphate is produced by the reaction of 4.52 g of phosphoric acid?
Round your answer to 3 significant digits.
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Solid Al and O2 gas react to form solid aluminum oxide. Suppose you have 2.0 mol of Al and 11.0 mol of O2
If half the Al can react, how many moles of aluminum oxide would be produced after half Al was used up. Round to the nearest 0.1 mol.
0.5 mol
Not possible for half Al to react
0.8 mol
0.7 mol
4.
FILL IN THE BLANK QUESTION
5 mins • 1 pt
Nitrogen dioxide gas and liquid water react to form aqueous nitric acid and nitrogen monoxide gas. Suppose you have 1.0 mol of nitrogen dioxide and 11.0 mol water in a reactor. Suppose as much as possible of the nitrogen dioxide reacts. How much will be left? Round your answer to the nearest .
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water. Suppose 52.6 g of hydrobromic acid is mixed with 16. g of sodium hydroxide. Calculate the maximum mass of sodium bromide that could be produced by the chemical reaction. Round your answer to 2 significant digits
41. g
43. g
45. g
50.g
6.
FILL IN THE BLANK QUESTION
10 mins • 1 pt
Liquid hexane (CH3(CH2)4CH3) reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. If 2.56 g of water is produced from the reaction of 6.89 g of hexane and 12.6 g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.
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