# C03 - Chemical Formulae And Equation

27 Questions | Total Attempts: 197  Settings Create your own Quiz Chemistry Form 4 Chapter 2 Chemical Formulae and Equation

• 1.
The proton number of sodium atom is 11 and its molar mass is 23 g/mol. What is the relative atomic mass sodium atom.
• A.

11

• B.

12

• C.

23

• D.

34

• 2.
The chemical formula for aluminium sulphate is   . What is its relative formula mass? [ Relative atomic mass : O = 16 Al = 27 S = 32 ]
• A.

123

• B.

150

• C.

182

• D.

342

• 3.
The chemical formula for tetrachloromethane is . What is the relative molecular mass of tetrachloromethane? [ Relative atomic mass : C = 12 Cl = 35.5 ]
• A.

154.0

• B.

118.5

• C.

83.0

• D.

47.5

• 4.
What is the relative molecular mass of hydrated magnesium sulphate .  [ Relative atomic mass : Mg = 24 S = 32 O = 16 H = 1 ]
• A.

145

• B.

246

• C.

305

• D.

356

• 5.
The chemical formula for pottasium hexacyanoferrate (III) is  . What is its relative formula mass. [ Relative atomic mass : C=12 N=14 K=39 Fe=56 ]
• A.

121

• B.

199

• C.

251

• D.

329

• 6.
The information regarding elements M and T are as follows: What is the molar mass of the compound formed when M and T react with each other?
• A.

62 g/mol

• B.

43 g/mol

• C.

32 g/mol

• D.

30 g/mol

• 7.
Table shows the electron arrangement and nucleon number for atoms E and G. Based on the table what is the relative molecular mass for compound formed when E reacts with G?
• A.

62

• B.

64

• C.

97

• D.

132

• 8.
The relative formula mass hydrated X carbonate.  is 286. What is the relative atomic mass of element X.  [ Relative atomic mass : H=1 C=12 O=16 ]
• A.

23

• B.

46

• C.

120

• D.

240

• 9.
The electron arrangement of atom U is 2.8.1 and atom V is 2.8.7. What is the molar mass of a compound formed when atom U combines with atom V? [Relative atomic mass: U=23, V=35.5]
• A.

152.5 g/mol

• B.

94.0 g/mol

• C.

81.5 g/mol

• D.

58.5 g/mol

• 10.
The average mass of a magnesium atom is 24 times greater than 1/12 of the mass of a carbon-12 atom. What is the relative atomic mass of magnesium?
• A.

2

• B.

12

• C.

24

• D.

48

• 11.
Hoe many times are 2 copper atoms haevier than an oxygen atom? [Relative atomic mass: O=16, Cu=64]
• A.

4

• B.

8

• C.

16

• D.

64

• 12.
The mass of three atoms of element X is equal to the mass of four carbon atoms. X is not the actual symbol of the element. What is the relative atomic mass of element X. [Relative atomic mass: C=12 ]
• A.

48

• B.

36

• C.

16

• D.

12

• 13.
The mass of two atoms of elemnt X is equal to that of three atoms of sulphur. What is the relative atomic mass of element X? [Relative atomic mass: S=32 ]
• A.

96

• B.

48

• C.

32

• D.

24

• 14.
8 atoms of element Z have the same mass as in 1 atom of tellurium, Te. Based on the statement above, what is the relative atomic mass of element Z? [Relative atomic mass: Te=128 ]
• A.

8

• B.

16

• C.

32

• D.

64

• 15.
Table shows the proton number and the nucleon number of atoms of elements X and Y. X and Y are not the actual symbols of the elements. Element X reacts with element Y to from a compound. What is the molar mass of the compound?
• A.

43 g/mol

• B.

50 g/mol

• C.

102 g/mol

• D.

113 g/mol

• 16.
Element J and element Q have proton number of 12 and 9 respectively. What is the relative formula mass of a compound formed between J and Q? [Relative atomic mass: J=24, Q=19 ]
• A.

30

• B.

43

• C.

62

• D.

67

• 17.
What is the defination of a mole? Given Number Avagadro =
• A.

The volume occupied by No Avagadro particles

• B.

The mass of a substance which consist of No. Avagadro atoms

• C.

The molecular mass of a substance which consist of No. Avagadro molecules

• D.

The quantity of a substance which has the same number of partivles as the number of atoms in 12.00 g of carbon-12

• 18.
The relative atomic mass of an element X is defined as
• A.

(Mass of one atom of X)/(1/12 mass of one corbon-12 atom)

• B.

(12 mass of one atom of X)/(Mass of one carbon-12 atom)

• C.

(Mass of one atom of X)/(12 mass of one carbon-12 atom)

• D.

(Mass of one mole of atom X)/(1/12 mass of one carbon-12 atom)

• 19.
Which of the following is correct for relative molecular mass?
• A.

(Mass of an atom)/(1/12 mass of one carbon-12 atom)

• B.

(Mass of one molecule)/(1/12 mass of one carbon-12 molecule)

• C.

(Mass of one molecule)/(1/12 mass of one carbon-12 atom)

• D.

(Mass of an atom)/(1/12 mass of one carbon-12 molecule)

• 20.
Which of the following statements is true for one mole of a substance? Given No. Avagadro =
• A.

1 mole of copper contains No. Avagadro molecules

• B.

1 mol of oxygen gas contains No. Avagadro atoms

• C.

1 mol of water contains the same number of atoms as in 12g of carbon-12

• D.

1 mol of carbon dioxide contains the same number of molecules as the number of atoms in 12 g of carbon-12

• 21.
Calsium carbonate  is the main component of marble. How many moles of atom of each element is present in 1 mol of calcium carbonate?
• A.

A

• B.

B

• C.

C

• D.

D

• 22.
What is the number of atoms in 0.5 mol of ammonia gas ?  [Avagadro constant = ] A.      B.     0.5 x C.     0.5 x 2 x D.     0.5 x 4 x
• A.

A

• B.

B

• C.

C

• D.

D

• 23.
Avagadro number is the number of [Relative atomic mass: He=4, C=12, Cl=35.5 and Ca=40]
• A.

Atoms in 12 g of carbon-12

• B.

Atoms in 8 g of helium

• C.

Molecules in 35.5 g of chlorine

• D.

Chloride ions in 11 g of calcium chloride

• 24.
A baloon contains   of gas particle. What is the number of moles of the gas in the baloon?
• A.

0.5 mol

• B.

1.0 mol

• C.

3.0 mol

• D.

6.0 mol

• 25.
One mole of a substance is defined as the quantity of a substance that contains the same number of particles as in m g of element Y. What are m and Y?
• A.

A

• B.

B

• C.

C

• D.

D

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