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gayaneshka [121]
3 years ago
11

when magnesium is burned in air the mass of the product is greater than the mass of the solid magnesium burned. A student claims

that this is a violation of the Low of conservation of mass do you agree or disagree with the claim. justify your answer
Chemistry
2 answers:
Nikitich [7]3 years ago
5 0
Veg egverbygbe rbbnfghjufddfg
il63 [147K]3 years ago
4 0
No, this is not a violation of the Law of conservation because when Magnesium is burnt it reacts with oxygen to form magnesium oxide. This end product is going to weigh more than the solid magnesium due to the addition of oxygen.
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A solution of NaOH is titrated with H2SO4. It is found that 20.05 mL of 0.3564 M H2SO4 solution is equivalent to 43.42 mL of NaO
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Answer : The concentration of NaOH is, 0.336 M

Explanation:

To calculate the concentration of base, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is H_2SO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=2\\M_1=0.3564M\\V_1=20.05mL\\n_2=1\\M_2=?\\V_2=43.42mL

Putting values in above equation, we get:

2\times 0.3564M\times 20.05mL=1\times M_2\times 43.42mL

M_2=0.336M

Thus, the concentration of NaOH is, 0.336 M

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