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Genrish500 [490]
3 years ago
11

Two or more different atoms are combined in definite proportions in any.

Chemistry
1 answer:
Stels [109]3 years ago
3 0
<span>That would be compound!
Compounds are pure substances, which consists of two or more elements chemically combined in a fixed proportion by mass. Compounds have definite proportion.</span>
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Answer:

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Explanation:

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2SO3(g)⟶2S(s)+3O2(g)ΔH=+790kJ. How many kilojoules are required when 2.1 moles of SO3 reacts?
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<u>Given:</u>

Enthalpy change (ΔH) for SO3 decomposition = +790 kJ

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<u>To determine:</u>

Energy required when 2.1 moles of SO3 reacts

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