How many grams of helium are present in the gas mixture
A volume of 18.0 m L contains a mixture of 0.250 mole N_2 , 0.250 mole O_2 , and an unknown quantity of He. The temperature of the mixture is 0 degrees C , and the total pressure is 1.00 atm . How many grams of helium are present in the gas mixture?
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A boatman must carry a wolf, a goat and a cabbage across a river in a boat which is so small that he can carry at most, only one of them with him in at a time.Moreover whenever the wolf and goat are together, he must also be present to keep th
for which K=130. assume that .406 mol of C(g) is placed in a cylinder that has a massless, frictionless piston. the temp is 300 K and the barometric pressure on the piston is constant at 1 atm. the original volume (before the .406 moles decompose)
Suppose a 5.00 L sample of O2 at a given temperature and pressure contains 2.73 × 1023 molecules. How many molecules would be contained in 5.00 L H2 at the same temperature and pressure?
If a 2.5 L reaction vessel initially contains 725 torr of cyclopropane at 485C , how long will it take for the partial pressure of cylclopropane to drop to below 105 ?
The temperature of the mixture is 0 degrees C , and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture?
Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
Bone was dissolved in hydrochloric acid, giving 50.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O
Given that 24.0mL of 0.170 M sodium iodide reacts with 0.209M mercury(II) nitrate solution. what is the mass of HgI2 precipitate?
16.5 The California ambient air quality standard for visibility requires that the average σ e be less than 0.23 km - 1 when the relative humidity is less than 70%. To what visual range does this limit correspond? To what aerosol mass conc
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