chemistry

posted by .

In one process of 5.75 kg of CaF2 are treated with an excess of H2SO4 and yield 2.85 kg of Hf calculate the percent yield of hf?

• chemistry -

Do you mean HF as in hydrofluoric acid. Hf is hafnium.
Write and balance the equation.
Convert g CaF2 to mols. moles = grams/molar mass.

Use the coefficients to convert mols CaF2 to mols HF (not Hf)

Convert mols HF to g. g = mols x molar mass. This is the theoretical yield (T. E.).

%yield = (actual yield/T.E.)*100 = ?

• chemistry -

86.55%

Similar Questions

1. Chemistry :)

Cr2O3 + 3CCl4 ---> 2CrCl3 + 3CCl2O In one experiment, 6.37 grams of Cr2O3 was treated wiht excess CCl4 and yielded 8.75 grams of CrCl3. What was the percent yeild?
2. Chemistry

Ca + F2 --> CaF2 The mass of CaF2 that results from the reaction of 3.00 g of calcium and 2.00 g of fluorine is 4.02 g. What is the percent yield?
3. Chem

Sulfuric acid, H2SO4, reacts with CaF2 according to: CaF2 + H2SO4 ---> CaSO4 + 2 HF What is the minimum amount, in g, of impure H2SO4 (which is 83.5% H2SO4 by mass) that would be required to produce 16.2 g of HF when reacted with …
4. Chemistry

I have this question and I am pretty sure on what to use to solve it but I am just stuck. The reaction of 8 g of hydrogen and 28 g of carbon monoxide gave 16 g of methanol. What was the theoretical yield if the percent yield was 50%?
5. chemistry

1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t
6. Chemistry

Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction below. CaF2 + H2SO4 CaSO4 + 2 HF In one process 9.00 kg of CaF2 …
7. Chemistry Pretest

Fe can be prepared as 2 Al + Fe2O3 ----> 2 Fe + Al2O3. Suppose that 0.450 moles of Fe2O3 are reacted with an excess of Al. Suppose that 43.6 grams of Fe are obtained. What is the percent yield of Fe?
8. Chemistry

1. The reaction CO+2H2-CH3OH was carried and it is found that only 332g of CH3Oh is actually produced when 407g CH3Oh was the expected yield. What is the Percent yield?
9. Chemistry

0.573 g of calcium chloride reacts with excess of 0.5 M Na3PO4 to form .523 g of isolated calcium phosphate precipitate. Determine theoretical yield, actual yield, and percent yield for this reaction.
10. chemistry

Assuming a yield of 26.10 percent calculate the actual yield of magnesium nitrate formed from 42.2 g of magnesium and excess copper(ii) nitrate .

More Similar Questions