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liberstina [14]
3 years ago
10

Coal and petroleum are useful because the both have ___ stored in them.

Chemistry
2 answers:
Mariana [72]3 years ago
6 0

Answer:

Energy is the answer. I just took the lesson

God bless!

gizmo_the_mogwai [7]3 years ago
5 0
I think the answer is 4 carbon dioxide
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2 years ago
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Describe what the isotopes of an element have in common and how are they different.
Neporo4naja [7]

Answer:

Isotopes of an element are atoms of the same element that have different number of neutrons.

8 0
3 years ago
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In this experiment you will create solutions with different ratios of ethanol and water. What is the mole fraction of ethanol wh
Andrej [43]

Answer:

The mole fraction of ethanol is 0.6. A 10 mL volumetric pipette must be used for to measure the 10 mL of ethanol. The vessel should be clean and purged.

Explanation:

For calculating mole fraction of ethanol, the amount of moles ethanol must be calculated. Using ethanol density (0.778 g/mL), 10 mL of ethanol equals to 7.89 g of ethanol and in turn 0.17 moles of ethanol. The same way for calculate the amount of water moles (ethanol density=0.997 g/mL). 2 mL of water correspond to 0.11. The total moles are: 0.17+0.11=0.28. Mole fraction alcohol is: 0.17/0.28=0.6

5 0
3 years ago
What is the last step in the scientific method?
yawa3891 [41]

Answer:

D. Communication of results

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3 years ago
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