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Questions

Question (1)

QN007460

The molecular mass of water (H₂O) is:

(A) 16 u
(B) 17 u
(C) 18 u
(D) 20 u

Correct Answer: C

Explanation:

(2 × 1) + 16 = 18 u

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Question (2)

QN007461

Molecular mass is defined as:

(A) Mass of one proton
(B) Sum of atomic masses of all atoms in a molecule
(C) Mass of electrons only
(D) Number of atoms in a molecule

Correct Answer: B

Explanation:

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Question (3)

QN007462

The molecular mass of carbon dioxide (CO₂) is:

(A) 28 u
(B) 32 u
(C) 44 u
(D) 46 u

Correct Answer: C

Explanation:

12 + (2 × 16) = 44 u

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Question (4)

QN007463

Which covalent compound has molecular mass 16 u?

(A) NH₃
(B) CH₄
(C) H₂O
(D) CO

Correct Answer: B

Explanation:

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Question (5)

QN007464

The molecular mass of ammonia (NH₃) is:

(A) 14 u
(B) 15 u
(C) 16 u
(D) 17 u

Correct Answer: D

Explanation:

14 + (3 × 1) = 17 u

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Question (6)

QN007465

The atomic mass of oxygen used in molecular mass calculations is:

(A) 8 u
(B) 12 u
(C) 16 u
(D) 18 u

Correct Answer: C

Explanation:

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Question (7)

QN007466

Which formula has molecular mass 28 u?

(A) N₂
(B) CO₂
(C) O₂
(D) CH₄

Correct Answer: A

Explanation:

14 + 14 = 28 u

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Question (8)

QN007467

Molecular mass is usually expressed in:

(A) kg
(B) g
(C) u
(D) cm³

Correct Answer: C

Explanation:

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Question (9)

QN007468

The molecular mass of oxygen gas (O₂) is:

(A) 16 u
(B) 18 u
(C) 28 u
(D) 32 u

Correct Answer: D

Explanation:

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Question (10)

QN007469

The molecular mass of methane (CH₄) is:

(A) 12 u
(B) 14 u
(C) 16 u
(D) 18 u

Correct Answer: C

Explanation:

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