Question

Навеску мрамора растворили в избытке соляной кислоты. Выделившийся в результате реакции газ занял объем 6,3л при температуре 18 градусов цельсия. Определить массу растворенной навески.

Answer 1

CaCO3+2HCl=CaCl2+CO2+H2O
n(CO2)=6.3/22.4=0.3 моль
по уравнению на 1 моль CaCO3 приходится 1 моль CO2, значит n(CaCO3)=n(CO2)=0.3 моль
Mr(CaCO3)=100
m(CaCO3)=100*0.3=30 г

Answer 2

Calculation of the Mass of the Dissolved Substance

To determine the mass of the dissolved substance, we need to use the ideal gas law equation, which relates the pressure, volume, temperature, and number of moles of a gas. The equation is as follows:

PV = nRT

Where: - P is the pressure of the gas - V is the volume of the gas - n is the number of moles of the gas - R is the ideal gas constant (8.314 J/(mol·K)) - T is the temperature in Kelvin

In this case, we know the volume of the gas (6.3 L) and the temperature (18 degrees Celsius). However, we don't have information about the pressure or the number of moles of the gas.

To solve this problem, we need additional information about the pressure or the number of moles of the gas. Without this information, it is not possible to calculate the mass of the dissolved substance.

If you have any additional information or if there is something else I can help you with, please let me know.