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Lemur [1.5K]
3 years ago
12

PLEASE HELPPP MEEEE

Chemistry
2 answers:
disa [49]3 years ago
5 0

Answer: Option (b) is the correct answer.

Explanation:

Freezing point is defined as the point at which liquid state of a substance changes into solid state.

So, in the given table it is shown that at temperature 18^{o}C the substance is changing into solid state. Whereas at 23^{o}C the substance is in liquid state.

Hence, 18^{o}C will be the freezing point of the substance.

Thus, we can conclude that the statement its freezing point is 18^{o}C, is correct about the unknown substance.

Cloud [144]3 years ago
4 0

The second statment is true and right. Hope this helps!!

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Answer:

Product D contains 30 J

Explanation:

We know energy does not destroy or create, it only transforms. So, at the right side of the equation we have the energy of the reactant A and the energy of the reactant B, as a sum, and, as a result we have to get the same energy plus the energy absorbed by the reaction.

So, we have,

Ea+Eb = Eabsorbed+Ec+Ed

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<h2>Let us derive empirical formula </h2>

Explanation:

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For C = 12 x 6 /288=0.25%

For N= 14 x 4 /288=0.19%

For 0= 16 x 10/288=0.5%

The elements present are :

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C      12                        0.25/12=0.020             0.02/0.02=1           2

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O       16                        0.5/16=0.03                   0.03/0.02=1.5       3

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Answer:

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