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Lemur [1.5K]
3 years ago
12

SOMEONE HELP ME ASAP!!!

Chemistry
2 answers:
nata0808 [166]3 years ago
4 0

Answer:

A

Explanation:

Irina-Kira [14]3 years ago
4 0
D is it right let me know if you got it :)
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how much heat is released when 70.9g of water at 66C cools to 25C? The specific heat of water is 1 cal/gC
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Answer:

-12162.47 joules (or -12000 joules when accounting for significant figures)

Explanation (btw I used 1 cal as 4.184 joules because SI units are better):

q = m c delta T

q = (70.9) (4.184) (25 - 66)  

q = (70.9) (4.184) (-41)

q = -12162.47 joules

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Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
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thermal energy

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what is the main difference between organisms that share many characteristics and organisms that do not
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Complete combustion of a 17.12mg sample of xylene In oxygen yielded 56.77mg
Veronika [31]

Xylene moles =\frac{17.12}{106.16×1000}=0.00016moles=

106.16×1000

17.12

=0.00016moles

Moles of CO_2 =\frac{56.77}{44.01×1000}=0.0013CO

2

=

44.01×1000

56.77

=0.0013

Moles of H_2O= =\frac{14.53}{18.02×1000}=0.0008H

2

O==

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14.53

=0.0008

Moles ratios

\frac{0.0013}{0.0008}=1.625

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0.0013

=1.625

\frac{0.0008}{0.0008}=1

0.0008

0.0008

=1

Hence molecular fomula

The empirical formula is C 4H 5.

The molecular formula C8H10

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2 years ago
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