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3 years ago

3.544g of hydrogen gas contains

Chemistry

1 answer:

Free_Kalibri [48]3 years ago

4 0

Answer:

1.772 mols

Explanation:

Because hydrogen exists as a diatomic molecule in gaseous state, that's (H2), so then it's molecular mass is 1 ×2= 2g/mol.

we can now calculate for the number of moles, so

n=m/Mr

n=3.544/2

n=1.772mols

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4 years ago

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romanna [79]

Answer:

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Balance Cr: $Cr_{2}O_{7}^{2-}(aq)\rightarrow 2Cr^{3+}(aq)$
Balance O and H in acidic medium: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$
Balance charge: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)+6e^{-}\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$ .......(2)

$[3\times Equation-(1)]+Equation(2)$ gives balanced equation:

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3 years ago