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dmitriy555 [2]
2 years ago
15

If the reaction of 5.87 moles of potassium with excess hydrobromic acid was able to produce 2.49 mol H2, what is the percent yie

ld of hydrogen gas? (3 points)
Unbalanced equation: K + HBr yields KBr + H2

1. 14.6%
2. 29.2%
3. 42.4%
4. 84.8%
Chemistry
1 answer:
olga_2 [115]2 years ago
7 0

Answer: 2. 29.2%

Explanation:

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1. How much heat (in calories) is needed to raise 20 g of H2O from 5°C to 40°C? (c = 1.0 cal/g °C)
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Answer:

700 calories

Explanation:

Using the formula below:

Q = m × c × ∆T

Where;

Q = amount of heat required (calories)

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∆T = change in temperature (°C)

According to this question, the following information was provided;

Q = ?

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According to Newton's third law, forces come in pairs. There is_____and an equal and opposite_____.
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<u>Explanation:</u>

On the off chance, when item A applies a force on item B, at that point item B must apply a force of equivalent size and inverse bearing back on object A. This Newton's third law speaks to a specific balance in nature: forces consistently happen two by two.

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\large \boxed{\text{197.4 g}}

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We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

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m/g:                          240.0

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