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:
The volume of carbon dioxide gas generated 468 mL.
Explanation:
The percent by mass of bicarbonate in a certain Alka-Seltzer = 32.5%
Mass of tablet = 3.45 g
Mass of bicarbonate =
Moles of bicarbonate ion =
According to reaction, 1 mole of bicarbonate ion gives with 1 mole of carbon dioxide gas , then 0.01840 mole of bicarbonate ion will give:
of carbon dioxide gas
Moles of carbon dioxide gas n = 0.01840 mol
Pressure of the carbon dioxide gas = P = 1.00 atm
Temperature of the carbon dioxide gas = T = 37°C = 37+273 K=310 K
Volume of the carbon dioxide gas = V
(ideal gas equation)
1 L = 1000 mL
0.468 L =0.468 × 1000 mL = 468 mL
The volume of carbon dioxide gas generated 468 mL.