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meriva
3 years ago
10

Which of the following represent isotopes of the same element?

Chemistry
1 answer:
Vladimir [108]3 years ago
3 0

Answer:

c. 1, 3 and 4

Explanation:

Isotopes of the same element have the same number of protons. Isotopes 1, 3 and 4 all have an atomic number of 92 meaning they have the same amount of protons (92 protons) and therefore belong to the same element.

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For the reaction N2(g) + 2H2(g) → N2H4(l), if the percent yield for this reaction is 100.0%, what is the actual mass of hydrazin
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Answer:

53.6 g of N₂H₄

Explanation:

The begining is in the reaction:

N₂(g) + 2H₂(g) → N₂H₄(l)

We determine the moles of each reactant:

59.20 g / 28.01 g/mol = 2.11 moles of nitrogen

6.750 g / 2.016 g/mol = 3.35 moles of H₂

1 mol of N₂ react to 2 moles of H₂

Our 2.11 moles of N₂ may react to (2.11 . 2) /1 = 4.22 moles of H₂, but we only have 3.35 moles. The hydrogen is the limiting reactant.

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Then, 3.35 moles, may produce (3.35 . 1)/2 = 1.67 moles of N₂H₄

Let's convert the moles to mass:

1.67 mol . 32.05 g/mol = 53.6 g

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