Caffeine has a molecular weight of $194$ . It contains $28.9$ % by mass of nitrogen. Number of atoms of nitrogen in one molecule of it is:

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Solution

The correct option is B $4$
$100$ g of Caffeine contains $= 28.9$ g of $N$ .
$∴ 194$ g of Caffeine contains $= \frac{28.9}{100} \times 194$ g $= 56$ g.
Number of moles of $N$ $= \frac{56}{14} = 4$
The number of atoms of $N$ is one molecule is $4$ .

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Q. Caffeine has a molecular weight of 194. If it contains

28.9 %

by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is:

Caffeine has a molecular weight of 194.If it contains 28.9% by mass of Nitrogen, the number of atoms of Nitrogen in one molecule of caffeine is(pls give an explanation for necessary steps)

Molar mass of caffeine is 194. If it contains 28.9% of nitrogen by mass, calculate the number of nitrogen atoms in one molecule of caffeine .

Q. Caffeine has

M o l . W t = 194

. It contains

28.9 %

by mass of Nitrogen in one molecule of caffeine.

Q. Caffeine (Mol. wt. = 194) contains 28.9% of nitrogen. How many number of nitrogen atoms are present in one molecule of caffeine?

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Caffeine has a molecular weight of 194. It contains 28.9% by mass of nitrogen. Number of atoms of nitrogen in one molecule of it is:

The correct option is B 4100 g of Caffeine contains =28.9 g of N.∴194 g of Caffeine contains =28.9100×194 g =56 g. Number of moles of N =5614=4The number of atoms of N is one molecule is 4.

Caffeine has a molecular weight of $194$ . It contains $28.9$ % by mass of nitrogen. Number of atoms of nitrogen in one molecule of it is:

The correct option is B $4$
$100$ g of Caffeine contains $= 28.9$ g of $N$ .
$∴ 194$ g of Caffeine contains $= \frac{28.9}{100} \times 194$ g $= 56$ g.
Number of moles of $N$ $= \frac{56}{14} = 4$
The number of atoms of $N$ is one molecule is $4$ .