jojo10092003
11.02.2020 •
Chemistry
You have a sample of calcium nitrate with a mass of 360 g. If the container has a mass of 26.9 grams, how many moles of calcium nitrate are in sample?
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Ответ:
3.162 kg
Explanation:
1) Mass percent = (mass of a part / total mass) × 100
2) 84% PbS by mass.
Percent PbS = ( mass of pure PbS / mass of the rock) × 100 = 84%
⇒ mass of the rock = mass of pure PbS × 100 / 84 =
⇒ mass of the rock = mass of pure PbS / 0.84 ← this is fhe formula that you will uise at the end.
2) Determine the mass of pure PbS that contains 2.3 kg of Pb
i) Unit formula: PbS
ii) molar mass of PbS: 207.2 g/mol + 32.065 g/mol = 239.265 g/mol
iii) proportion:
207.2 g of Pb / 239.265 g of PbS = 2,300 g of Pb / x
⇒ x = 2,300 × 239.265 g of PbS / 207.2 = 2,655.93 g of PbS = 2.656 Kg of PbS
4) Use the formula to determine how many kilograms of the rock contain 2.565 kg of pure PbS
mass of the rock = mass of pure PbS / 0.84 = 2.565 / 0.84 = 3.162 kg