19)A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr, what is the new pressure?A)1000 torrB)200 torrC)10 torrD)50 torrE)100 torr
19)20)A system receives 575 J of heat and delivers 425 J of work. Calculate the change in theinternal energy, ΔE, of the system.
20)21)A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and1.00 atm. What is the molar mass of the gas?
21)22)Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, wasused by the ancient Romans as mortar in stone structures. The reaction for this processis Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(g) ΔH= –69.1 kJWhat is the enthalpy change if 3.8 mol of calcium carbonate is formed?22)
23)Which of the following is a correct set of quantum numbers for an electron in a 3dorbital?A)n= 3, l= 3, ml= +2B)n= 3, l= 2, ml= –2C)n= 3, l= 1, ml= +3D)n= 3, l= 2, ml= 3E)n= 3, l= 0, ml= –1B‐