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Olegator [25]
3 years ago
12

Please help on question 7 and 8​

Chemistry
1 answer:
lesantik [10]3 years ago
3 0

Answer:

7. 5km/h

8. 10km/h

I just need to add characters so i can post

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An unknown compound is found to have a molar mass of 392.16 g/mol. If the empirical formula is C2H5PF2, what is the molecular fo
notsponge [240]

Answer:

C8H20P4F8

Explanation:

Molecular formula is based off a ratio of the molecular formula's molar mass divided by the empirical formula's molar mass.

The molar mass of the empirical formula C2H5PF2 is 98.02g. We find this by adding the molar masses of all elements in the formula, multiplied by their subscripts.

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We then divide the molecular molar mass by the empirical molar mass.

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This tells us that the molecular formula has 4 times the mass of the empirical formula. Because mass comes from the elements in the formula, we multiply all the subscripts by 4 to get the molecular formula.

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8 0
2 years ago
Does anybody know the answer if so explain
a_sh-v [17]

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I believe answer is d a synthesis reaction

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