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Volgvan
3 years ago
14

Which two substances are covalent compounds?

Chemistry
1 answer:
BARSIC [14]3 years ago
8 0

Answer:

Option B is correct: C6H1206(s) and HCl(g)

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Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:
ankoles [38]
DeltaH formation = deltaH of broken bonds - deltaH of formed bonds

Broken bonds: tiple bond N-N and H-H bond
Formed bonds: N-H and N-N bonds

You also have to take note of the molar coefficients

deltaH formation = <span> [(N≡N) + 2 * (H-H)] - [4 * (N-H) + (N-N)] 
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The answer is 17 kJ/mol.</span>
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What is the formula mass of MgO (how much does one mole of it weigh)
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Answer:

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