Question 1

Silver nitrate, $AgNO_3$, reacts with ferric chloride, $FeCl_3$, to give silver chloride, AgCl,
and ferric nitrate, $Fe(NO_3)_3$. In a particular experiment, it was planned to mix a
solution containing 25.0 g of $AgNO_3$ with another solution containing 45.0 grams of
$FeCl_3$. How many grams of the reactant in excess will remain after the reaction is over?

Accepted Answer

37.10 g

Answer

5.42 g

Answer

0.147 g

Answer

10.23 g

Question 2

Solid calcium carbonate, CaCO3, is able to remove sulphur dioxide from waste gases by the reaction:
 CaCO3 + SO2 + other reactants ------> CaSO3 + other products
In a particular experiment, 255 g of $CaCO_3$ was exposed to 135 g of $SO_2$ (limiting) in
the presence of an excess amount of the other chemicals required for the reaction. What is the theoretical yield of CaSO3?

Accepted Answer

253 g

Answer

35.87 g

Answer

78.3 g

Answer

154 g

Question 3

Consider the reaction ...
 $I_2O_5$(g) + 5CO(g) ---> $5CO_2$(g) + $I_2$(g)                                                                                                       80.0 grams of iodine(V) oxide, I2O5, reacts with 28.0 grams of carbon monoxide. Determine the mass of iodine I2, which could be produced?

Accepted Answer

50.7 g

Answer

34.7 g

Answer

24.8 g

Answer

12.9 g

Question 4

Zinc and sulphur react to form zinc sulphide according to the equation. If 25.0 g of zinc and 30.0 g of sulphur are mixed, How many grams of ZnS will be formed?

Accepted Answer

37.1 g

Answer

23.8 g

Answer

42.5 g

Answer

17.7 g

Question 5

Which element is in excess when 3 grams of Mg is ignited in 2.20 grams of pure
oxygen?

Accepted Answer

$O_2$

Answer

MgO

Answer

$Mg_2O_2$

Answer

Mg

Question 6

How many grams of $Al_2S_3$ are formed when 5.00 grams of Al is heated with 10.0
grams S?

Accepted Answer

13.9 g

Answer

11.3 g

Answer

21.1 g

Answer

8.17 g

Question 7

The following reaction is performed with 1.56 g $BaCl_2$. We isolate 1.82 g of our desired product, AgCl.                                                                                            $BaCl_​2$​​ (aq)  +  $AgNO_3$
​​ (aq)   →    2AgCl (s)  +  $Ba(NO_3)_2$(aq)                      What is the percent yield of the reaction?

Accepted Answer

84.6%

Answer

92.3 %

Answer

73.4 %

Answer

67.12 %

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