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NikAS [45]
3 years ago
12

How many moles of Nitrogen in 40.0 g of N2O? .14 g 25.5 g 14.5 g

Chemistry
1 answer:
Paul [167]3 years ago
8 0

Answer:

To do this question. we first have to find the mass% of nitrogen in N2O and then, using that percentage, we can simply find the number of moles of N from the number of moles of N2O

<u></u>

<u>Mass % of Nitrogen:</u>

Mass% of nitrogen = (Molar mass of N2 / Molar mass of N2O)*100

Mass% nitrogen = (28 / 44)*100

Mass% of Nitrogen = 0.63 * 100

Mass% nitrogen = 63%

<u>Mass of Nitrogen:</u>

So, now we can say that in any given mass of N2O. 63% of the total mass is the mass of Nitrogen

Hence, total mass * 63/100 = Mass of Nitrogen

Replacing the variables

40 * 0.63 = Mass of Nitrogen

Mass of Nitrogen = 25.2 grams

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How many atoms of oxygen are present in 7.51 grams of<br> glycine with formula C₂H5O2N?
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1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N. Details about number of atoms can be found below.

How to calculate number of atoms?

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

However, the number of moles of oxygen in glycine can be calculated using the following expression:

Molar mass of C₂H5O2N = 75.07g/mol

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Hence; 32/75.07 × 7.51 = 3.2grams of oxygen in glycine

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