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Svetllana [295]
3 years ago
7

The natural abundance of 2h is 0.015% and that of 18o is 0.20%. How many 2h218o molecules are there in 1.0 moles of water?

Chemistry
1 answer:
Ulleksa [173]3 years ago
6 0

Answer:

\boxed{2.7 \times 10^{13}}

Explanation:

Probability of one ²H is 0.00015 = 1.5× 10⁻⁴

Probability of two ²H is 1.5× 10⁻⁴ × 1.5 × 10⁻⁴ = 2.25 × 10⁻⁸

Probability of two ²H plus one ¹⁸O is 2.25 × 10⁻⁸ × 0.0020

= 4.5× 10⁻¹¹

Molecules in 1.0 mol water = 1.0 × 6.022 × 10²³ × 4.5 × 10¹¹

= 2.7 × 10¹³

There are 2.7 × 10¹³ molecules of  ²H₂¹⁸O in 1.0 mol of water.

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What is Mass perventage ?

Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100.

Molecular mass of urea (NH2CONH2) is= 2× (Atomic mass of N ) + 4 × (Atomic mass of H) + (Atomic mass of C) (Atomic mass of O) = 60

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molar mass of C6H14N4O2=174g/mol

moles of N atoms in C6H14N4O2=4

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mass percent of N in C6H14N4O2=(56/174)*100=32.2%

the chemical formula for ornithine is C5H12N2O2

molar mass of C5H12N2O2=132g/mol

moles of N atoms in C5H12N2O2=2

mass of N atoms in C5H12N2O2=2*14=28

mass percent of N in C5H12N2O2=(28/132)*100=21%

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