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photoshop1234 [79]
3 years ago
11

The Universe is composed of...?

Chemistry
2 answers:
exis [7]3 years ago
8 0
A.
everything in existence.
Olegator [25]3 years ago
5 0
The answer is A. everything in existence...please give brainliest answer if I helped you. :)
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A solution has a hydronium concentration of 1.3 x 10^-3M. What is the ph of the solution?
Serjik [45]

Answer:

2.89

Explanation:

pH=-log(H+)

- Hope that helps! Please let me know if you need further explanation.

7 0
2 years ago
How much heat is released when 24.8 g of ch4 is burned in excess oxygen gas?
balu736 [363]

The given question is incomplete. The complete question is:

How much heat is produced when 24.8 g of CH_4 is burned in excess oxygen gas

Given: CH _4
+2O_2\rightarrow CO_2+2H_2O  ΔH= −802 kJ.

Answer: 1243.1 kJ

Explanation:

Heat of combustion is the amount of heat released on complete combustion of 1 mole of substance.

Given :

Amount of heat released on combustion of  1 mole of methane = 802 kJ kJ/mol

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

1 mole of CH_4 weighs = 16 g  

Thus we can say:  

16 g of CH_4 on combustion releases heat = 802 kJ

Thus 24.8 g of CH_4 on combustion releases =\frac{802}{16}\times 24.8=1243.1kJ

Thus heat released when 24.8 g of methane is burned in excess oxygen gas is 1243.1 kJ

4 0
3 years ago
A Brønsted-Lowry acid Question 9 options: A) has a lower pH than vinegar. B) is any species that donates a proton. C) is any spe
rusak2 [61]

Answer:

B) is any species that donates a proton.

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Which of the following equations does not demonstrate the law of conservation of mass
tia_tia [17]
The answer is c :) i hope its the right answer
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