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What is the molar mass of 3 moles of ammonia molecule (NH₃)?
A. 15 g
B. 17 g
C. 45 g
D. 51 g

Sodium hydroxide reacts with hydrochloric acid to form sodium chloride and water according to the equation below.
NaOH (aq) + HCl (aq) → NaCl (aq) + H₂O (l)
Which substance will be in excess if 10 g of sodium hydroxide reacts with 10 g of hydrochloric acid?
A. HCl
B. H₂O
C. NaCl
D. NaOH

Kerosene is a complex liquid mixture of _____
A. C₁₃-C₂₅ hydrocarbons.
B. C₁₁-C₁₂ hydrocarbons
C. C₅-C₁₀ hydrocarbons
D. C₂₆-C₂₈ hydrocarbons

Choose the appropriate answer to the relative formula mass (RFM) of barium carbonate.
A. 204
B. 320
C. 185
D. 197

The percentage of sodium in sodium hydrogen carbonate is
A. 43.4%
B. 0.27%
C. 52.6%
D. 27.4%

Which of the following statements is TRUE of galvanic cell?
A. A cell that uses electrical energy to bring about a chemical change.
B. The AA battery used in a portable CD player is an example of a galvanic cell.
C. In a galvanic cell, there is not electrolyte.
D. In galvanic cells, electrons flow from cathode to anode.

Answer :

Let's go through each part of the question step-by-step:

  1. Molar Mass of Ammonia (NH₃):

    • To find the molar mass of ammonia, we need to sum the atomic masses of nitrogen and hydrogen.
    • Nitrogen has an atomic mass of approximately 14 g/mol and hydrogen has an atomic mass of approximately 1 g/mol.
    • Since there are three hydrogen atoms in ammonia, the calculation is:
      [tex]\text{Molar mass of } \text{NH}_3 = 14\ g/mol\ (\text{N}) + 3\times1\ g/mol\ (\text{H}) = 17\ g/mol[/tex]
    • The molar mass of one mole of ammonia is 17 g/mol. Thus, the mass of 3 moles is:
      [tex]3 \times 17\ g = 51\ g[/tex]
    • Correct answer: D. 51 g.

  2. Excess Reactant in Reaction of Sodium Hydroxide and Hydrochloric Acid:

    • The balanced chemical equation is:
      [tex]\text{NaOH (aq) + HCl (aq) → NaCl (aq) + H}_2\text{O (l)}[/tex]
    • Molar mass of NaOH is approximately 40 g/mol.
    • Molar mass of HCl is approximately 36.5 g/mol.
    • Calculate moles of NaOH:
      [tex]\frac{10\ g}{40\ g/mol} = 0.25\text{ moles}[/tex]
    • Calculate moles of HCl:
      [tex]\frac{10\ g}{36.5\ g/mol} = 0.274\text{ moles}[/tex]
    • Since these react in a 1:1 ratio, NaOH is the limiting reactant and HCl is in excess.
    • Correct answer: A. HCl.

  3. Kerosene Hydrocarbon Mixture:

    • Kerosene is a mixture composed predominantly of hydrocarbons in the [tex]\text{C}_{13}\text{-C}_{25}[/tex] range.
    • Correct answer: A. \text{C}{13}\text{-C}{25} hydrocarbons.

  4. Relative Formula Mass of Barium Carbonate:

    • Barium carbonate (BaCO₃) consists of Barium (Ba), Carbon (C), and Oxygen (O).
    • Atomic masses: Ba = 137 g/mol, C = 12 g/mol, O = 16 g/mol
    • Relative formula mass calculation:
      [tex]137\ g/mol\ (\text{Ba}) + 12\ g/mol\ (\text{C}) + 3\times16\ g/mol\ (\text{O}) = 197\ g/mol[/tex]
    • Correct answer: D. 197.

  5. Percentage of Sodium in Sodium Hydrogen Carbonate (NaHCO₃):

    • Sodium has an atomic mass of 23 g/mol.
    • Molar mass of NaHCO₃:
      [tex]23\ g/mol\ (\text{Na}) + 1\ g/mol\ (\text{H}) + 12\ g/mol\ (\text{C}) + 3\times16\ g/mol\ (\text{O}) = 84\ g/mol[/tex]
    • Percentage of sodium:
      [tex]\frac{23}{84}\times100\% \approx 27.38\%[/tex]
    • Correct answer: D. 27.4%.

  6. True Statement About Galvanic Cell:

    • A galvanic cell uses a spontaneous redox reaction to generate electric current. It does not use external energy to bring about a chemical change.
    • AA batteries are indeed examples of galvanic cells.
    • Electrolyte is required for ion transfer.
    • In galvanic cells, electrons flow from anode to cathode.
    • Correct answer: B. The AA battery used in a portable CD player is an example of a galvanic cell.

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