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bezimeni [28]
3 years ago
6

Compare the two elements H and Na

Chemistry
1 answer:
Oxana [17]3 years ago
6 0

Explanation:

H is hydrogen and Na is sodium.

Hydrogen is the first element of the periodic table. Its atomic no is 1. Its atomic weight is 1.008. Its electronic configuration is 1s¹.

Na is hydrogen. It lies at 3rd period and 1st group. Its atomic number is 11. Its atomic weight is 22.989769 u. Its electronic configuration is 2,8,1.

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A salt lover decided to flavor her meal by adding 2.50 moles of sodium chloride,
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Answer:

\large \boxed{5.5 \times 10^{22}\text{ molecules of P$_{2}$O}_{5}}

Explanation:

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\text{Moles of P$_{4}$O}_{10} = \text{13 g P$_{4}$O}_{10} \times \dfrac{\text{1 mol P$_{4}$O}_{10}}{\text{283.89 g P$_{4}$O}_{10}} = \text{0.0458 mol P$_{4}$O}_{10}

2. Moles of P₂O₅

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The molar ratio is 2 mol P₂O₅:1 mol P₄O₁₀

\text{Moles of P$_{2}$O}_{5} = \text{0.0458 mol P$_{4}$O}_{10} \times \dfrac{\text{2 mol P$_{2}$O}_{5}}{\text{1 mol P$_{4}$O}_{10}} = \text{0.0916 mol P$_{2}$O}_{5}

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\text{No. of molecules} = \text{0.0916 mol P$_{2}$O}_{5} \times \dfrac{6.022 \times 10^{23}\text{ molecules P$_{2}$O}_{5}}{\text{1 mol P$_{2}$O}_{5}}\\\\= \mathbf{5.5 \times 10^{22}}\textbf{ molecules P$_{2}$O}_{5}\\\text{There are $\large \boxed{\mathbf{5.5 \times 10^{22}}\textbf{ molecules of P$_{2}$O}_{5}}$}

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4 years ago
Can someone please help me? :(
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Answer:

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I am not sure
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