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4 years ago

Thermochemical Equations Practice

Chemistry

1 answer:

sleet_krkn [62]4 years ago

6 0

Answer:

755.625 kj

Explanation:

Given data:

Heat released by two mole of H₂ = 241.8 Kj

Heat released by 12.5 grams of H₂ = ?

Solution:

Number of moles of hydrogen:

Number of moles = mass/ molar mass

Number of moles = 12.5 g/ 2 g/mol

Number of moles = 6.25 mol

Chemical equation:

2H₂ + O₂ → 2H₂O + 241.8 kj

Now we will determine the heat released by 6.25 moles of hydrogen.

2 mole = 241.8 kj

1 mole =241.8 kj/2 = 120.9 kj

120.9 kj × 6.25 = 755.625 kj

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