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CHECK TASKS

1. Determine the mass of 3.5 mol of KHSiO 3.

2. How much mole contains in 245 g substance H 3PO 4?

3. How many molecules are contained in 1.1 kg of Zn (OH) 2?

4. Determine the mass (in grams) of one molecule SO 2.

5. What volume takes CO 2 at a temperature of 57 °C and a pressure of 2340 mm, if

its weight is equal to 78 mg?

6. Determine the equivalent masses of chromium (III) hydroxide, orthophosphate

acid, potassium sulfite.

7. How many equivalents are contained in 4.9 g Cu (OH) 2?

8. Determine the molecular mass of gas if it has a mass of 652 mg in a volume of

600 ml and an air volume of 0.8 liters under similar conditions has a mass of 0.9 g.

9. Calculate the mass fractions of each of the elements in Fe 2(SO 4) 3.

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