Sterling silver contains 92.5% silver and 7.5% copper. A sterling silver dish weighs 185.0 g. What mass of copper is in the dish
2 answers:
<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.
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Answer:
Explanation:
We need to use the formula for heat of vaporization.
Identify the variables.
- The heat absorbed by the evaporating water is the <u>latent heat of vaporization. </u>For water, that is 2260 Joules per gram.
- Q is the energy, in this problem, 50,000 Joules.
- m is the mass, which is unknown.
Substitute the values into the formula.
We want to find the mass. We must isolate the variable, m.
m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.
Divide. Note that the Joules (J) will cancel each other out.
Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.
The mass is about 22 grams, so choice B is correct.