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Multiple Choice
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1

Which is the molar mass of acetylsalicylic acid (aspirin), C9H8O4:
A)29 g
B)108 g
C)196 g
D)180 g
E)none of the above
2

The reaction Fe3O4 + C ---> CO2 + Fe can be balanced with the coefficients:
A)1,2,2,3
B)1,4,4,3
C)2,4,4,3
D)1,1,1,3
3

How many hydrogen atoms are present in 42 g of ammonium carbonate?
A)3.5
B)8
C)2.6 x 1023
D)1.1 x 1024
E)2.1 x 1024
4

How many phosphorus atoms are in 2.57 g of P?
A)4.99 x 1022 atoms
B)4.80 x 1025 atoms
C)7.26 x 1024 atoms
D)0.0829 atoms
E)2.57 atoms
5

What is the mass of 5.45 x 10-3 mol of glucose C6H12O6?
A)0.158 g
B)981 g
C)3.03 x 10-5 g
D)0.981 g
E)none of the above
6

What is the percent yield of PI3, if 58.62 g of I2 are reacted with an excess of phosphorus according to the following equation and 60.75 g are actually obtained? 2 P(s) + 3 I2(s) ---> 2PI3(s)
A)84.97 %
B)1.57 %
C)48.37 %
D)37.6 %
E)95.8 %
7

In the reaction of Fe3O4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of Fe3O4 to products is:
A)0.05
B)0.1
C)0.2
D)0.3
E)0.4
8

Given the reaction CH4 + 2O2 ----------> 2H2O + CO2 which statement is FALSE?
A)16 g O2 reacts to form 18 g H2O
B)16 g CH4 combines with 64 g O2
C)1 mol CO2 is formed from 2 mol O2
D)1 mol CH4 reacts to form 2 mol H2O
E)18 g H2O is produced from 1 mol O2
9

The reaction C7H16 + O2 ---> CO2 + H2O can be balanced with the coefficients:
A)1, 9, 6, 8
B)2, 10, 7, 8
C)1, 11, 7, 8
D)1, 10, 7, 8
10

A mole of H2
A)contains 6 x 1023 atoms
B)contains 6 x 1023 molecules
C)contains 1 gram of hydrogen
D)is 6 x 1023 grams of hydrogen
E)none of the above
11

What is the coefficient of CO2 when the following equation is properly balanced with the smallest set of whole numbers? C4H10 + O2 ---> CO2 + H2O
A)1
B)4
C)6
D)12
E)8
12

The correct coefficients for the unbalanced equation below are: CoBr3 + Na2CO3 ---> Co2(CO3)3 + NaBr
A)1,3,1,6
B)2,3,1,6
C)2,1,1,2
D)1,1,1,3
13

Caustic soda, NaOH, can be prepared commercially by the reaction of Na2CO3 with slaked lime, Ca(OH)2. How many grams of NaOH can be obtained by treating 1.350 kg of Na2CO3 with Ca(OH)2?
A)1788.8 g
B)1019 g
C)1.79 g
D)509.4 g
E)1.02 g
14

The coefficients needed to balance the second step of the Ostwald process, __ NO. + __ O2 -----> __ NO2 , are
A)1, 1, 1
B)2, 1, 2,
C)2, 5/2, 2
D)4, 5, 4
E)none of the above





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