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miss Akunina [59]
3 years ago
13

Which of the following is an endothermic reaction?

Chemistry
2 answers:
telo118 [61]3 years ago
5 0
The answer is the reaction ins a cold pack
aev [14]3 years ago
3 0
Combustion of methane. 
reason behind this is because an endothermic reaction basically means releasing heat when a chemical reaction occurs "endo" meaning outside and "thermic" meaning heat  
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Here:

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shusha [124]

Answer:

Correct option is

B

5 liters of CH

4

(g)NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

7 0
3 years ago
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