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Biology etea medical mcqs
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MDCAT ENGLISH MCQs
Biology etea medical mcqs
etea Chemistry
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How many moles of O₂ are produced from the decomposition of 245 g of KClO₃ (molar mass ≈ 122.5 g/mol)? (2KClO₃ → 2KCl + 3O₂)

2 moles
3 moles
1.5 moles
4 moles

ETEA MCQS.COM
Moles and Avogadro’s Numbers

In the reaction 2K + 2H₂O → 2KOH + H₂, 78 g of K (molar mass ≈ 39 g/mol) will produce ___ moles of H₂.

1 mole
2 moles
0.5 moles
4 moles

ETEA MCQS.COM
Moles and Avogadro’s Numbers

To calculate the mass of a product from the mass of a reactant, one must use the molar masses of both substances and the:

Avogadro's number
Molar volume
Mole ratio
Density

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Moles and Avogadro’s Numbers

A stoichiometric amount refers to the exact amount of reactants needed to react completely, based on the:

Molar mass
Mole ratio
Density
Volume

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Moles and Avogadro’s Numbers

Stoichiometry is based on the law of:

Multiple Proportions
Definite Proportions
Conservation of Mass
Gaseous Volumes

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Moles and Avogadro’s Numbers

From the reaction above (5 mol N₂ and 9 mol H₂), the maximum moles of NH₃ produced are:

10 moles
9 moles
6 moles
5 moles

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Moles and Avogadro’s Numbers

5 moles of N₂ and 9 moles of H₂ are mixed to produce NH₃ (N₂ + 3H₂ → 2NH₃). The limiting reactant is:

N₂
H₂
NH₃
No limiting reactant

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Moles and Avogadro’s Numbers

Using 16 g of CH₄ and 32 g of O₂ for combustion (CH₄ + 2O₂ → CO₂ + 2H₂O), the limiting reactant is:

CH₄
O₂
CO₂
H₂O

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Moles and Avogadro’s Numbers

In the reaction of 10g of H₂ with 64g of O₂ (2H₂ + O₂ → 2H₂O), the limiting reactant is:

H₂
O₂
H₂O
Both reactants are in excess

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Moles and Avogadro’s Numbers

The reaction of 10 moles of H₂ with 10 moles of O₂ (2H₂ + O₂ → 2H₂O) will produce ___ moles of H₂O. (Limiting Reactant)

10 moles
20 moles
5 moles
15 moles

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Moles and Avogadro’s Numbers

For the reaction 2A + B → 3C, the mole ratio of B to C is:

2:01
2:03
1:03
3:01

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Moles and Avogadro’s Numbers

To completely react with 3 moles of Cl₂ according to 2Al + 3Cl₂ → 2AlCl₃, one needs ___ moles of Al.

1.5 moles
2 moles
3 moles
4.5 moles

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Moles and Avogadro’s Numbers

Given the reaction SiO₂ + 4HF → SiF₄ + 2H₂O, 4 moles of HF can produce ___ moles of SiF₄.

1 mole
2 moles
4 moles
0.5 moles

ETEA MCQS.COM
Moles and Avogadro’s Numbers

The reaction 3H₂ + N₂ → 2NH₃ shows that 3 molecules of hydrogen react with 1 molecule of nitrogen. This is the same as saying _ moles of H₂ react with _ mole of N₂.

3, 1
1, 3
2, 1
1, 2

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Moles and Avogadro’s Numbers

Given 2HBr + Cl₂ → 2HCl + Br₂, 0.8 moles of HBr will produce ___ moles of Br₂.

0.8 moles
0.4 moles
1.6 moles
0.2 moles

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Moles and Avogadro’s Numbers

In any stoichiometric problem, the first step is to ensure you have a:

Correct mole ratio
Balanced chemical equation
Molar mass value
Given volume

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Moles and Avogadro’s Numbers

If 0.1 moles of C₃H₈ are burned (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O), the moles of O₂ required are:

0.1 moles
0.3 moles
0.4 moles
0.5 moles

ETEA MCQS.COM
Moles and Avogadro’s Numbers

The coefficients in the balanced equation 2C + O₂ → 2CO can be interpreted as a ratio of:

Grams
Atoms
Molecules and/or Moles
Liters

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Moles and Avogadro’s Numbers

In 4P + 5O₂ → 2P₂O₅, to produce 1 mole of P₂O₅, one needs ___ moles of P.

1
2
4
0.5

ETEA MCQS.COM
Moles and Avogadro’s Numbers

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