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Scilla [17]
3 years ago
8

(5 x 10-21) - (4 x 10-22)​

Chemistry
2 answers:
Alborosie3 years ago
6 0

Answer:

11

Explanation:

5×10-21 = 29

4×10-22 = 18

29 - 18 = 11

Ivanshal [37]3 years ago
5 0

Answer:

29     and      18

Explanation:

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Compare homogeneous and heterogeneous mixtures?
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A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances.
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Why is it that the higher the molecular mass of the alkane, the higher the boiling point? Refer to intermolecuar forces and ener
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A 20 g piece of metal with specific heat 0.4 J/g.°C absorbs 3.9 kilojoules of heat,
Ket [755]

Answer:

given that

....the mass of the metal is 20g(0.02kg)

....specific heat capacity(c) is 0.4J/g°C

....ΔT=??

heat(Q)=3.9KJ(3900J)

Q=mcΔT

ΔT= Q/mc

.....=3900÷(20g x 0.4J/g°C)

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8 0
3 years ago
What is the percent by mass of C in benzene (C6H6)? The molecular weight of carbon is 12.0107 g/mol and of hydrogen 1.00794 g/mo
pshichka [43]

Answer:

92.26% of C

Explanation:

To solve this problem we must assume we have 1 mole of benzene. The mole contains 6 moles of C and 6 moles of H. We have to convert these moles to grams in order to find the total mass and mass percent will be:

Mass atom / Total mass * 100

<em>Mass C: </em>6mol C * (12.0107g / mol) = 72.0642g

<em>Mass H: </em>6mol H * (1.00794g / mol) = 6.04764g

<em>total mass: </em>72.0642g + 6.04764g = 78.11184g

Mass percent of C will be:

72.0642g C / 78.11184g* 100

<h3>92.26% of C</h3>

3 0
3 years ago
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