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Question (31)

QN007540

The formula unit mass of sodium carbonate (Na₂CO₃) is:

(A) 84 u
(B) 96 u
(C) 106 u
(D) 118 u

Correct Answer: C

Explanation:

(2 × 23) + 12 + (3 × 16) = 106 u

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Question (32)

QN007541

Which ionic compound has formula unit mass 74.5 u?

(A) NaCl
(B) KCl
(C) MgO
(D) CaO

Correct Answer: B

Explanation:

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Question (33)

QN007542

The formula unit mass of calcium nitrate [Ca(NO₃)₂] is:

(A) 124 u
(B) 148 u
(C) 164 u
(D) 180 u

Correct Answer: C

Explanation:

40 +

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Question (34)

QN007543

Formula unit mass helps chemists to:

(A) Identify ionic compounds quantitatively
(B) Measure temperature
(C) Determine pressure
(D) Find electric field strength

Correct Answer: A

Explanation:

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Question (35)

QN007544

The formula unit mass of barium chloride (BaCl₂) is:

(A) 137 u
(B) 172 u
(C) 208 u
(D) 244 u

Correct Answer: C

Explanation:

137 + (2 × 35.5) = 208 u

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Question (36)

QN007545

Which formula unit contains polyatomic ion?

(A) NaCl
(B) MgO
(C) Na₂SO₄
(D) KBr

Correct Answer: C

Explanation:

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Question (37)

QN007546

The formula unit mass of aluminium chloride (AlCl₃) is:

(A) 97.5 u
(B) 106.5 u
(C) 133.5 u
(D) 154.5 u

Correct Answer: C

Explanation:

27 + (3 × 35.5) = 133.5 u

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Question (38)

QN007547

Formula unit mass is numerically obtained by:

(A) Subtracting atomic masses
(B) Multiplying atomic numbers
(C) Adding atomic masses of ions
(D) Dividing valencies

Correct Answer: C

Explanation:

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Question (39)

QN007548

The formula unit mass of potassium carbonate (K₂CO₃) is:

(A) 100 u
(B) 118 u
(C) 138 u
(D) 154 u

Correct Answer: C

Explanation:

(2 × 39) + 12 + (3 × 16) = 138 u

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Question (40)

QN007549

The formula unit mass of copper(II) oxide (CuO) is:

(A) 63.5 u
(B) 79.5 u
(C) 95.5 u
(D) 111.5 u

Correct Answer: B

Explanation:

63.5 + 16 = 79.5 u

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Question (31)

The formula unit mass of sodium carbonate (Na₂CO₃) is:

Explanation:

Link:

Question (32)

Which ionic compound has formula unit mass 74.5 u?

Explanation:

Link:

Question (33)

The formula unit mass of calcium nitrate [Ca(NO₃)₂] is:

Explanation:

Link:

Question (34)

Formula unit mass helps chemists to:

Explanation:

Link:

Question (35)

The formula unit mass of barium chloride (BaCl₂) is:

Explanation:

Link:

Question (36)

Which formula unit contains polyatomic ion?

Explanation:

Link:

Question (37)

The formula unit mass of aluminium chloride (AlCl₃) is:

Explanation:

Link:

Question (38)

Formula unit mass is numerically obtained by:

Explanation:

Link:

Question (39)

The formula unit mass of potassium carbonate (K₂CO₃) is:

Explanation:

Link:

Question (40)

The formula unit mass of copper(II) oxide (CuO) is:

Explanation:

Link:

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