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Assessment on Quantitative chemistry
Posted by Admin on 15-03-2014 at 3:22 pm Under Chemistry Cafe

Quantitative chemistry

 

1.       How many molecules are present in a drop of ethanol, C2H5OH, of mass 2.3 × 10–3 g?
(L = 6.0 × 1023 mol–1)

A.      3.0 × 10 19

B.      3.0 × 1020

C.      6.0 × 1020

D.      6.0 × 1026

(Total 1 mark)

2.       What is the sum of all coefficients when the following equation is balanced using the smallest possible whole numbers?

                                                    __ C2H2 + __O2 → __CO2 + __H2O

A.      5

B.      7

C.      11

D.      13

(Total 1 mark)

3.       1.7 g of NaNO3 (Mr = 85) is dissolved in water to prepare 0.20 dm3 of solution. What is the concentration of the resulting solution in mol dm–3?

A.      0.01

B.      0.1

C.      0.2

D.      1.0

(Total 1 mark)

 

 

4.       Which sample has the greatest mass?

A.      1 mol of SO2

B.      2 mol of N2O

C.      2 mol of Ar

D.      4 mol of NH3

(Total 1 mark)

5.       The relative molecular mass of a gas is 56 and its empirical formula is CH2. What is the molecular formula of the gas?

A.      CH2

B.      C2H4

C.      C3H6

D.      C4H8

(Total 1 mark)

6.       What mass, in g, of hydrogen is formed when 3 mol of aluminium react with excess hydrochloric acid according to the following equation?

                                                2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)

A.      3.0

B.      4.5

C.      6.0

D.      9.0

(Total 1 mark)

7.       What is the total number of hydrogen atoms in 1.0 mol of benzamide, C6H5CONH2?

A.      7

B.      6.0 × 1023

C.      3.0 × 1024

D.      4.2 × 1024

(Total 1 mark)

8.       Chloroethene, C2H3Cl, reacts with oxygen according to the equation below.

                 2C2H3Cl(g) + 5O2(g) → 4CO2(g) + 2H2O(g) + 2HCl(g)

          What is the amount, in mol, of H2O produced when 10.0 mol of C2H3Cl and 10.0 mol of O2 are mixed together, and the above reaction goes to completion?

A.      4.00     B.  8.00        C.      10.0        D.     20.0

(Total 1 mark)

9.     What is the concentration of NaCl, in mol dm–3, when 10.0 cm3 of 0.200 mol dm–3 NaCl solution is added to 30.0 cm3 of 0.600 mol dm–3 NaCl solution?

A.    0.450

B.    0.300

C.    0.500

D.    0.800

(Total 1 mark)

10.   Which of the following is consistent with Avogadro’s law?

A.     = constant (V, n constant)

B.     = constant (P, n constant)

C.    Vn = constant (P, T constant)

D.     = constant (P, T constant)

(Total 1 mark)

11.   5 dm3 of carbon monoxide, CO(g), and 2 dm3 of oxygen, O2(g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, CO2(g), in dm3, that can be formed?

                                            2CO(g) + O2(g) → 2CO2

A.    3

B.    4

C.    5

D.    7

(Total 1 mark)

12.   Which statement about solutions is correct?

A.    When vitamin D dissolves in fat, vitamin D is the solvent and fat is the solute.

B.    In a solution of NaCl in water, NaCl is the solute and water is the solvent.

C.    An aqueous solution consists of water dissolved in a solute.

D.    The concentration of a solution is the amount of solvent dissolved in 1 dm3 of solution.

(Total 1 mark)

 

13.   Which sample has the greatest mass?

A.    6.0 × 1025 molecules of hydrogen

B.    5.0 mol of neon atoms

C.    1.2 × 1024 atoms of silver

D.    1.7 × 102 g of iron

(Total 1 mark)

14.   4.00 mol of a hydrocarbon with an empirical formula of CH2 has a mass of 280 g. What is the molecular formula of this compound?

A.    C2H4

B.    C3H6

C.    C4H8

D.    C5H10

(Total 1 mark)

15.   What will be the concentration of sulfate ions in mol dm–3 when 0.20 mol of KAl(SO4)2 is dissolved in water to give 100 cm3 of aqueous solution?

A.    0.2

B.    1.0

C.    2.0

D.    4.0

(Total 1 mark)

16.   The volume of an ideal gas at 27.0 °C is increased from 3.00 dm3 to 6.00 dm3. At what temperature, in °C, will the gas have the original pressure?

A.    13.5

B.    54.0

C.    327

D.    600

(Total 1 mark)

 

 

 

17.   Which coefficients would balance this equation?

                      __ MnO2 + __ HCl → __ MnCl2 + __ Cl2 + __ H2O

 

 

MnO2

HCl

MnCl2

Cl2

H2O

A.

1

2

1

1

1

B.

1

3

1

1

1

C.

1

4

1

1

2

D.

1

4

1

2

2

(Total 1 mark)

18.     What volume of carbon dioxide, in dm3 under standard conditions, is formed when 7.00 g of ethene (C2H4, Mr = 28.1) undergoes complete combustion?

A.     

B.     

C.     

D.     

(Total 1 mark)

19.     What is the coefficient for H2SO4(aq) when the following equation is balanced, using the smallest possible integers?

__Mg3N2(s) + __H2SO4(aq) → __MgSO4(aq) + __(NH4)2SO4(aq)

A.      1

B.      3

C.      4

D.      7

(Total 1 mark)

20.     What volume, in cm3, of 0.200 mol dm–3 HCl(aq) is required to neutralize 25.0 cm3 of 0.200 mol dm–3 Ba(OH)2(aq)?

A.      12.5

B.      25.0

C.      50.0

D.      75.0

(Total 1 mark)

 

Anup Sharma

 
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