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1) A 0.441g sample of gas has a volume of 118mL at 61.4°C and 755mmHg .What is the molar mass of this gas? Express your answer with the appropriate units. 2) A 2.42-L container of H2(g) at 756mm Hg and 24°C is connected to a 3.48-L container of He(g) at 718mm Hg and 24°C. After mixing, what is the total gas pressure, in millimeters of mercury, with the temperature remaining at 24°C? 3) A 1.67g sample of Al reacts with excess HCl, and the liberated H2 is collected over water at 25°C at a barometric pressure of 744mmHg . What volume of gaseous mixture, in liters, is collected? 2Al(s)+6HCl(aq)→2AlCl3(aq)+3H2(g) 4) A sample of O2(g) is collected over water at 24 °C. The volume of gas is 1.17L . In a subsequent experiment, it is determined that the mass of O2 present is 1.46g . What must have been the barometric pressure at the time the gas was collected? (Vapor pressure of water = 22.4 torr.) 5) Calculate u_rms, in meters per second, for O2(g) mole cules at 30 °C. 6) If 0.00435mol N2O(g) effuses through an orifice in a certain period of time, how much NO2(g) would effuse in the same time under the same conditions? 7) What is the ratio of the diffusion rates for N2 and O2? 8) What is the ratio of the diffusion rates for H2O and D2O (D=deuterium, i.e., 21H )? 9) What is the ratio of the diffusion rates for 14CO2 and 12CO2? 10) What is the ratio of the diffusion rates for 235UF6 and 238UF6?
2C4H10 + 13O2 → 8CO2 + 10H2O The equation shows the combustion of butane (C4H10). How many moles of water can be produced by 12.5 moles of C4H10 with excess oxygen?
Identify the major type of attractive force between particles of each of the following substances: a) HCl; b) MgF2; c) PBr3; d) Br2; e) NH3.
When an ion-selective electrode for X was immersed in 0.0670 M XCl, the measured potential was 0.0250 V. What is the concentration of X when the potential is 0.0400 V
A bottle of wine contains 12.5% ethanol by volume. The density of ethanol is 0.789 g/cm3. Calculate concentration of ethanol in wine in terms of mass percent and molality.
Calculate the individual concentrations of C and of D in the following unknown mixture: Compound C: Absorbance at 365nm = 0.150 Absorbance at 470nm
A certain gaseous oxide of sulfur has an effusion rate that is 0.707 times the effusion rate of oxygen gas
An unknown hydrate of calcium nitrate, Ca(NO3)2 * XH2O, is heated to give 30.5% water. What is the water of crystallization (X) for the hydrate
What Amount of enrgy has been transferred to heat the water? (The specific heat capacity of water is 4.184 J/g *C )
A 50.0mL sample of 0.0240 M NH3(aq) is titrated with aqueous HCl. What is the pH after the addition of 15.0mL of 0.0600 M HCl(aq) kb of NH3= 1.8x10^-5.
Show mechanism of acetal formation through hemiacetal starting with 3-methylbutanal yieleding ethanol and h+
The dinitrogen oxide molecule has the atomic order NNO rather than the symmetrical NON arrangement. Suggest a possible reason.
1. Describe the method you would use to seperate a mixture of water(boiling point=100) can be seperated from ethanol(boiling point= 60c)
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