Question 1

How many grams of $H_2O$ will be produced by 3.14 L of $CH_4$ at STP? Assume an excess of $O_2$.

Accepted Answer

5.05 g $H_2O$

Answer

4.87 g $H_2O$

Answer

2.12 g $H_2O$

Answer

6.43 g $H_2O$

Question 2

How many moles are in 58.6 L of nitrogen gas $(N_2$) at STP?

Accepted Answer

2.62 moles

Answer

3.54 moles

Answer

5.12 moles

Answer

1.79 moles

Question 3

How many moles in 127.5 grams of sodium chloride (NaCl)?

Accepted Answer

2.182 moles NaCl

Answer

3.212 moles NaCl

Answer

4.345 moles NaCl

Answer

5.621 moles NaCl

Question 4

How many moles are in 32.7 grams of ethanol $(C_2H_6O)$?

Accepted Answer

0.710 moles $(C_2H_6O)$

Answer

2.175 moles $(C_2H_6O)$

Answer

7.654 moles $(C_2H_6O)$

Answer

4.987 moles $(C_2H_6O)$

Question 5

How many moles of $O_2$ are needed to combine with 8.4 moles of $H_2S$?  2 $H_2S$ + 3 $O_2$ --> 2 $SO_2$ + 2 $H_20$

Accepted Answer

12.6 moles $0_2$

Answer

22.6 moles $0_2$

Answer

32.6 moles $0_2$

Answer

2.6 moles $0_2$

Question 6

Accepted Answer

3$O_2$  +$8OH^-$ + $2Cr^3$ $^+$ --> $H_2O$ + $3H_2O_2$ + $Cr_2O_7
^2$ $^-$

Answer

4$O_2$  +$8OH^-$ + $2Cr^3$ $^+$ --> $H_2O$ + $3H_2O_2$ + $Cr_2O_7
^2$ $^-$

Answer

3$O_2$  +$5OH^-$ + $2Cr^3$ $^+$ --> $H_2O$ + $3H_2O_2$ + $Cr_2O_7
^2$ $^-$

Answer

3$O_2$  +$8OH^-$ + $2Cr^3$ $^+$ --> $H_2O$ + $9H_2O_2$ + $Cr_2O_7
^2$ $^-$

Question 7

Determine the oxidizing agent and the reducing agent in the following reaction    2Sr + $O_2$ --> 2SrO

Accepted Answer

O is the oxidizing agent and Sr is the reducing agent

Answer

Sr is the oxidizing agent and O is the reducing agent

Question 8

Determine the oxidizing agent and the reducing agent in the following reaction $KMnO_4$ + HCl --> $MnCl_2$ + $Cl_2$ + $H_2O$ + KCl

Accepted Answer

$KMnO_4$ is the oxidizing agent and  HCl  is the reducing agent

Answer

$KMnO_4$ is the reducing agent and  HCl  is the oxidizing agent

Question 9

What is the oxidation number of S in $NaHSO_4$

Accepted Answer

+6

Answer

-2

Answer

+2

Answer

+4

Question 10

What is the oxidation number of  C in $C_2O_4$ $^2$ $^-$?

Accepted Answer

+3

Answer

+2

Answer

+4

Answer

-4

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