31. Solving a chemistry problem

31. Solving a chemistry problem

1. Determine the mass of toluene vapor C7H8 in a room with a volume of 30 dm3 at 25 C. The vapor pressure of toluene at this temperature is 2972 Pa.

2.14 g of metal react with 2 dm3 of oxygen under normal conditions. Determine the molar equivalent mass of the metal oxide.

3. What is the structure of the Q-layer of an excited bismuth atom?

4. Compare the radii of atoms: scandium and gallium.


6. Indicate the sign of the change in entropy during water condensation.

7. The equilibrium constant of the reaction H2+I2↔2HI at 445 C is 50. How many moles of hydrogen must be taken per 1 mole of iodine in order to convert 80% of the latter into hydrogen iodide?

8. How many times will the rate of the direct reaction 2NO+Cl2→2NOCl (all substances are gases) change when the total volume of the system increases by 3 times?

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