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Paha777 [63]
2 years ago
8

Which statement describes what happens in a chemical reaction?

Chemistry
2 answers:
NNADVOKAT [17]2 years ago
6 0

Answer: pic

Explanation:

plz

sp2606 [1]2 years ago
3 0

Answer:

4. matter is neither created nor destroyed

Explanation:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

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What is the molecular formula of the hydrocarbon whose molar mass is 536 g/mol and contains 89.55 w/w% carbon?
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Given the percentage composition of HC as C → 81.82 % and H → 18.18 %

So the ratio of number if atoms of C and H in its molecule can will be:

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So the Empirical Formula of hydrocarbon is:

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As the mass of one litre of hydrocarbon is same as that of C O 2 The molar mass of the HC will be same as that of C O 2 i.e 44 g mol

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Hence the molecular formula of HC is C 3 H 8

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