15. Ideal gases
A section of Physics, 9702
Listing 10 of 88 questions
State what is meant by a mole. Two containers A and B are joined by a tube of negligible volume, as illustrated in . container A 3.1 × 103 cm3 17 °C container B 4.6 × 103 cm3 30 °C The containers are filled with an ideal gas at a pressure of 2.3 × 105 Pa. The gas in container A has volume 3.1 × 103 cm3 and is at a temperature of 17 °C. The gas in container B has volume 4.6 × 103 cm3 and is at a temperature of 30 °C. Calculate the total amount of gas, in mol, in the containers. amount = mol
9702_s11_qp_42
THEORY
2011
Paper 4, Variant 2
View
State what is meant by a mole. Two containers A and B are joined by a tube of negligible volume, as illustrated in . container A 3.1 × 103 cm3 17 °C container B 4.6 × 103 cm3 30 °C The containers are filled with an ideal gas at a pressure of 2.3 × 105 Pa. The gas in container A has volume 3.1 × 103 cm3 and is at a temperature of 17 °C. The gas in container B has volume 4.6 × 103 cm3 and is at a temperature of 30 °C. Calculate the total amount of gas, in mol, in the containers. amount = mol
9702_s11_qp_43
THEORY
2011
Paper 4, Variant 3
View
State what is meant by the Avogadro constant NA, the mole. A container has a volume of 1.8 × 104 cm3. The ideal gas in the container has a pressure of 2.0 × 107 Pa at a temperature of 17 °C. Show that the amount of gas in the cylinder is 150 mol. Gas molecules leak from the container in at a constant rate of 1.5 × 1019 s−1. The temperature remains at 17 °C. In a time t, the amount of gas in the container is found to be reduced by 5.0%. Calculate the pressure of the gas after the time t, pressure = Pa the time t. t = s
9702_s16_qp_42
THEORY
2016
Paper 4, Variant 2
View
State what is meant by the Avogadro constant. State the relationship between the Avogadro constant NA, the molar gas constant R and the Boltzmann constant k. Two samples X and Y of ideal gases are both at thermodynamic temperature T. Sample X has volume V and consists of N molecules, each of mass m. Sample Y has volume 2V and consists of 2N molecules, each of mass 2m. Complete Table 3.1 by giving expressions, in terms of some or all of N, m, T, V and the constants in , for the quantities indicated. Table 3.1 sample X sample Y pressure amount of substance mean-square speed of molecules internal energy The temperature of sample X is now varied. On , sketch the variation with thermodynamic temperature of the root-mean- square (r.m.s.) speed of the molecules of the gas. thermodynamic temperature r.m.s. speed
9702_w24_qp_41
THEORY
2024
Paper 4, Variant 1
View
State what is meant by the Avogadro constant. State the relationship between the Avogadro constant NA, the molar gas constant R and the Boltzmann constant k. Two samples X and Y of ideal gases are both at thermodynamic temperature T. Sample X has volume V and consists of N molecules, each of mass m. Sample Y has volume 2V and consists of 2N molecules, each of mass 2m. Complete Table 3.1 by giving expressions, in terms of some or all of N, m, T, V and the constants in , for the quantities indicated. Table 3.1 sample X sample Y pressure amount of substance mean-square speed of molecules internal energy The temperature of sample X is now varied. On , sketch the variation with thermodynamic temperature of the root-mean- square (r.m.s.) speed of the molecules of the gas. thermodynamic temperature r.m.s. speed
9702_w24_qp_43
THEORY
2024
Paper 4, Variant 3
View
Questions Discovered
88