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n200080 [17]
3 years ago
7

Need help fast please I am timed and giving 47 points.

Chemistry
2 answers:
Leokris [45]3 years ago
6 0

Answer:

C

Explanation:

antiseptic1488 [7]3 years ago
3 0

Answer:

C - 3

Explanation:

This can be actually tested

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Atoms in a liquid are farther apart than the atoms in a gas
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False because liquids are more closly packed than Gases

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Why would soap be unable to get laundry completely clean in areas with hard water?
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Not Going To Be a Idiot. Hope This Helps.

Explanation:

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3 years ago
Which of the following generalized equations best represents a combustion reaction?
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7 0
4 years ago
If the combustion of fossil fuels adds about 5 x 1012 kg of carbon to the atmosphere as CO2 each year, how much oxygen is requir
Ne4ueva [31]
Hello!

The general chemical reaction for the combustion of a fossil fuel is the following one:

C(s) + O₂(g) → CO₂(g)

Now, we use the following conversion factor to go from kilograms of CO₂ to kilograms of O₂, using the molar masses of each compound and the reaction coefficients:

5*10^{12} kg CO_2* \frac{1000g}{1 kg}* \frac{1 molCO_2}{44,01 g CO_2}* \frac{1 mol O_2}{1 mol CO_2}* \frac{32gO_2}{1molO_2}* \frac{1kg}{1000g} \\  \\ = 3,64*10^{12}kgO_2

So, for producing 5*10¹² kg of CO₂, 3,64*10¹² kg of O₂ are required. 

Have a nice day!
6 0
4 years ago
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