Answer:
So, electrolysis of water produces 2 volumes of hydrogen gas and 1 volume of oxygen gas because the ratio of hydrogen and oxygen elements in water is 2:1 by volume. Therefore, the amount of gases collected in two test tubes is not equal.
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Answer:
The volume (in ml) of a 3.57 M solution of 
that contains 0.884 moles of is 247.61g mL
Explanation:
According to the definition of Molarity
which sates
"The amount of moles of a substance present in one litre of the solution is called as Molarity."
3.57M solution implies that 1000 mL of the solution conatins 3.57Moles of
Hence , 3.57 moles of is present in the 1000 ml of solution
Now,
In 1 mole of is present in the =
ml of solution
Similarily ,
In 0.884 moles of is present in the 
of solution= 247.61g mL
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Answer:
0.025 moles of NO₂ will produced
Explanation:
Given data:
Moles of NO₂ formed = ?
Volume of HNO₃ = 25.0 mL
Molarity of HNO₃ = 2 M
Solution:
Chemical equation:
Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O
Number of moles of HNO₃:
Molarity = number of moles / volume in L
2M = number of moles / 0.025 L
Number of moles = 2 M × 0.025 L
Number of moles = 0.05 mol
Now we will compare the moles of HNO₃ with NO₂ from balance chemical equation.
HNO₃ : NO₂
4 : 2
0.05 : 2/4×0.05 =0.025
0.025 moles of NO₂ will produced.
_2k + _F2—> _2KF
put a 2 before the K and before the KF and you’re all good. it needed to be balanced with the F2
