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Chemistry Asked by a SnapAndSolve user · about 2 hours ago

823 g of a hydrated metal chromate is heated only 1.479 g of anhydrous metal chromate remains. What is the...

Question 1
1.823 g of a hydrated metal chromate is heated only 1.479 g of anhydrous metal chromate remains. What is the formula of the hydrate? The atomic mass of the metal is 40.078 g/mole.
- MetalCrO4•9H2O
- MetalCrO4•4H2O
- MetalCrO4•5H2O
- MetalCrO4•6H2O
- MetalCrO4•3H2O
- MetalCrO4•2H2O
Question 2
5.061 g of a hydrated metal sulfate is heated only 2.472 g of anhydrous metal sulfate remains. What is the formula of the hydrate? The atomic mass of the metal is 24.305 g/mole and has a +2 charge.
- MetalSO4•7H2O
- MetalSO4•5H2O
- MetalSO4•6H2O
- MetalSO4•4H2O
- MetalSO4•10H2O
- MetalSO4•6H2O
- MetalSO4•4H2O
- MetalSO4•2H2O
Question 3
How is the mass of water in a hydrate measured?
- The measured mass after the first heating is the mass of the water.
- The difference between the mass of the hydrate and the final heating is the mass of the water.
- The measured mass after the final heating is the mass of the water.
- The difference between the mass of the hydrate and the first heating is the mass of the water.
- The mass of the hydrate is the mass of the water.

Answer

  1. To find the formula of the hydrate, calculate the mass of water lost: 1.823 g - 1.479 g = 0.344 g. The molar mass of water is 18.015 g/mol. Moles of water = 0.344 g / 18.015 g/mol = 0.0191 mol. Moles of anhydrous metal chromate = 1.479 g / (40.078 + 51.996 + 4*15.999) g/mol = 0.00955 mol. Ratio of water to metal chromate = 0.0191 mol / 0.00955 mol = 2. Therefore, the formula is MetalCrO4•2H2O.

  2. Calculate the mass of water lost: 5.061 g - 2.472 g = 2.589 g. Moles of water = 2.589 g / 18.015 g/mol = 0.1438 mol. Moles of anhydrous metal sulfate = 2.472 g / (24.305 + 32.065 + 4*15.999) g/mol = 0.0207 mol. Ratio of water to metal sulfate = 0.1438 mol / 0.0207 mol = 6.95, approximately 7. Therefore, the formula is MetalSO4•7H2O.

  3. The correct method is: The difference between the mass of the hydrate and the final heating is the mass of the water.

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