Answer:
68.7% is the percent of frozen freshwater.
Answer:
The answer is sodium chloride
Explanation:
since Na is more reactive than Ag it displaces the Ag from AgCl
check the reactivity series to prove the point
The water molecules are not completely removed so additional heating is required.
Explanation:
We have the copper (II) sulfate pentehydrate with the chemical formula CuSO₄ · 5H₂O.
molar mass of CuSO₄ · 5H₂O = 159.6 + 5 × 18 = 249.6 g/mole
Knowing this, we devise the following reasoning:
if in 249.6 g of CuSO₄ · 5H₂O there are 90 g of H₂O
then in 8 g of CuSO₄ · 5H₂O there are Y g of H₂O
Y = (8 × 90) / 249.6 = 2.88 g of water
mass of dried CuSO₄ = mass of CuSO₄ · 5H₂O - mass of H₂O
mass of dried CuSO₄ = 8 - 2.88 = 5.12 g
5.12 g is less that the weighted mass of 6.50 g. We deduce from this that the sample needs additional heating in order to remove all the water (H₂O) molecules.
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hydrates
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A."0.42"
or
D. but this formula is weird we take the mass 25 multiply by 10.5 we get 262.5
A. we divide 25 / 10.5 we get 0.42
it 50/50
Hope i can help at least little
