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tatyana61 [14]
4 years ago
5

Please help! Thanks

Chemistry
2 answers:
GarryVolchara [31]4 years ago
5 0
I believe the third choice is correct.

This can be proven by the fact that to find the molar mass of a compound, you simply add the molar masses of all the atoms within the compound

Hope this helps
zlopas [31]4 years ago
4 0
I think that the 3rd choice is the answer as well as the other girl said
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the answer to your question is

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3 0
3 years ago
5) answer is A
Burka [1]

Answer:

A)  positive; added

Explanation:

Based on the reaction:

2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)

<em>2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.</em>

<em />

That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.

Thus, right answer is:

A)  positive; added

3 0
3 years ago
A magnesium atom has 2 valence electrons in its third shell.
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D. It will lose 2 electrons in order to become stable.
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3 years ago
I can't decide what to ship bacudeku or tododeku ​
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Answer:

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Just because I ship that doesn't mean i don't secretly ship bakudeku

Explanation:

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