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andreyandreev [35.5K]
3 years ago
9

[H+] = 2.5 x 10-10 M What’s the pH

Chemistry
1 answer:
Reika [66]3 years ago
6 0

Answer:

9.6

Explanation:

pH = - log[2.5*10^{-10}]= 9.6

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How many total atoms are in 0.670 g of p2o5?
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The molecular formula for compound is  P_{2}O_{5} mass of compound is 0.670 g.

To calculate number of atoms first calculate number of moles in the compound as follows:

n=\frac{m}{M}

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n=\frac{0.670 g}{283.886 g/mol}=0.00236 mol

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From the molecular formula 1 mole of P_{2}O_{5} has 2 mol of P (phosphorus) and 5 mol of O (oxygen).

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n_{P}=2\times 0.00236 mol=0.00472 mol

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n_{O}=5\times 0.00236 mol=0.0118 mol

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Number of atoms of P will be:

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Similarly, number of atoms of O will be:

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N_{Total}=N_{P}+N_{O}=2.84\times 10^{21}+7.11\times 10^{21}=9.95\times 10^{21} atoms

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Igoryamba

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