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goblinko [34]
3 years ago
13

How many moles of He are in 16g of the element

Chemistry
2 answers:
Maurinko [17]3 years ago
4 0
Molar mass of helium is 4.00<span> g/mol.</span>
Mole (mol): The number of particles (atoms or molecules) in a.
sample of element or compound with a mass in grams equal to the.
<span>atomic (or molecular) weight.</span>
Katyanochek1 [597]3 years ago
3 0

Answer:

4 moles of He

Explanation:

We have, 16g of He (Helium).

To calculate the number of moles in given amount of a substance, we have the formula.

\text{Number of moles} = \frac{\text{Given mass}}{\text{Molar mass}}.

Here, we have 16g of He.

So, \text{Given mass}=16g

Molar mass of He is 4g

On substituting the values in the equation, we get

\text{Number of moles} = \frac{\text{16}}{\text{4}}

\text{Number of moles}=4 \text{moles of He}

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Answer:

Partial pressure of CO₂ is 406.9 mmHg

Explanation:

To solve the question we should apply the concept of the mole fraction.

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We have the total moles of the mixture, if we have the moles for each gas inside. (3.63 moles of O₂, 1.49 moles of N₂ and 4.49 moles of CO₂)

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We replace values: (4.49 moles / 9.61 moles) . 871 mmHg = 406.9 mmHg

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