Chemistry Practice Test – Mass-Volume Relationship In Reactions

Hello and Welcome to Chemistry – Mass-Volume Relationship In Reactions

  1. You are to attempt 5 random objectives questions ONLY.
  2. Supply Your Full Name and Location in the text box below and begin immediately.
  3. You can attempt as many times as possible
1. 


What mass of sodium trioxocarbonate (IV) is needed to prepare 1 dm3 of a 0.3M solution.
(Na = 23; C = 12; O = 16)

A. 31.8 g       
B. 106 g       
C. 10.6 g       
D. 3.18 g

2. 


A small conical flask contains 72 g of petrol (C8H8). How many molecules of petrol are there in the flask? (C = 12, H = 1; Avogadro’s constant = 6.02 x 1023)

A. 0.632 mol       
B. 1.14 x 1023 mol       
C. 3.80 x 1020 mol       
D. 3.80 x 1023 mol

3. 


Calculate the number of moles of CaCl2 that can be obtained from 15 g of CaCO3 in the presence of excess HCl.

CaCO3(s) + 2HCl(aq)  CaCl2(aq) + CO2(g) + H2(g)

[Ca = 40; C = 12; O = 16; H = 1; Cl = 35.5] (NECO 2022)

A. 0.15  
B. 0.30 
C. 3.33  
D. 6.67

4. 


If 200 cm3 of a certain gas weighs 0.5 g at s.t.p, calculate its molar mass. [1 mole of a gas at s.t.p occupies 22.4 dm3] (NECO 2022)

A. 24  
B. 28  
C. 56  
D. 100

5. 


What mass of sodium oxide, Na2O could be obtained by burning 11.5 g of sodium in air?

A. 92 g  
B. 124 g  
C. 115 g  
D. 15.5 g

 

 

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