<u>Answer:</u> The mass of copper in the dish is 13.875 grams.
<u>Explanation:</u>
We are given:
(m/m) % of copper = 7.5 %
This means that 7.5 grams of copper are present in 100 grams of solution.
We need to find the mass of copper in 185 grams of sterling silver dish.
To calculate the mass of copper, we use unitary method, we get:
In 100 g of sterling silver dish, the mass of copper is 7.5 grams.
So, in 185 grams of sterling silver dish, the mass of copper is =
Hence, the mass of copper in the dish is 13.875 grams.
Explanation:
Given parameters:
Number of molecules = 4.21 x 10²³ molecules
Unknown parameters:
Number of moles
Solution:
A mole can be defined as the amount of a substance that contains the avogadro's number of particles i.e 6.02 x 10²³
To find the number of moles:
Number of moles = }[/tex]
Number of moles = }{
}[/tex]
Number of moles of CaCl₂ = 0.699moles
Learn more;
mole calculation brainly.com/question/13064292
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Answer : The molecular weight of this compound is 891.10 g/mol
Explanation : Given,
Mass of compound = 12.70 g
Mass of ethanol = 216.5 g
Formula used :
where,
= change in freezing point
= temperature of pure ethanol =
= temperature of solution =
= freezing point constant of ethanol =
i = van't hoff factor = 1 (for non-electrolyte)
m = molality
Now put all the given values in this formula, we get
Therefore, the molecular weight of this compound is 891.10 g/mol