According to the law of conservation of mass, how much zinc was present in the zinc carbonate?
1 answer:
Answer : The correct option is, 104 grams.
Explanation :
Law of conservation of mass : It states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
The balanced chemical reaction will be,
According to the law of conservation of mass,
Total mass of reactant side = Total mass of product side
Total mass of = Total mass of
Mass of + Mass of
= Mass of
+ Mass of
As we are given :
Mass of = 64 g
Mass of = 192 g
Mass of = 152 g
So,
Mass of + Mass of
= Mass of
+ Mass of
64 g + 192 g = 152 g + Mass of
Mass of = (64 + 192) - 152
Mass of = 104 g
Therefore, the mass of zinc present in the zinc carbonate was 104 grams.
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Answer:
The final temperature of the system is 27.3°C.
Explanation:
Heat lost by aluminum = 3.99 × 0.91 × (100-T)
= 3.631 (100-T)
Heat gained by water = 10 × 4.184 × (T-21)
= 41.84 (T-21)
As,
Heat gained = Heat loss
or, 3.631(100-T) = 41.84(T-21)
or,363.1 - 3.631 T = 41.84 T - 878.64)
or, (41.84+ 3.631) T = 878.64 +363.1
or T=
or, T = 27.3°C
Hence the final temperature is 27.3°C.