daltons law of partial pressures

a mixture of helium and neon gases is collected over water at 28.0 C and 745 mmHg. if the partial pressure of helium is 368 mmHg, what is the partial pressure of neon?

kinetic molecular theory of gases

the temp. in the stratosphere is - 23 C . calculate the root-mean-square speeds of N_2 O_2 and O_3 molecules in this region.

Chemistry word problem

Assuming that gasoline is 100% isooctane,that isooctane burns to produce only CO2 and H2O,and that the density of isooctane is 0.6955 g/mL,what mass of CO2(in Kg)is produced each year by the annual U.S. gasoline consumption of 460,000,000,000L.

Chemistry word problem

What volume(at STP)of hydrogen gas must be burned to provide the same amount of energy as 1L of isooctane? The density of isooctane is 0.69545g/mL and the standard molar heat of combustion of isooctane is -5456.6 kj/mol.

Chemistry word Problem

The Apparatus shown below consists of 3 temperature-jacketed 1.000 L bulbs connected by stopcocks.Bulb A conatains a mixture of H2O(g),CO2(g),and N2(g) at 25 degees C and a total pressure of 564 mmHg.Bulb B is empty and is held at a temp of -70 degrees C.Bulb C is also empty and is held at a temp of -196 degrees C.You may negl ...continues

Chemistry word problem

10.1 g CaO is dropped into a styrofoam coffee cup containing 157 g H2O at 18.0 degrees C.If the following reaction occurs,then what temp will the water reach,assuming the cup is a perfect insulator and the cup absorbs only a negligible amount of heat? CaO(s) + H2O(l) yields Ca(OH)2(s) delta H rxn= -64.8 kJ/mol

Chemitry word problem

The surface temperature of Venus is about 1050K and the pressure is about 75 Earth atmospheres.Assuming that these conditions represent a Venerian "STP",what is the standard molar volume (in liters)of a gas on Venus?(Extra Credit: "Venusian",while commonj,is incorrect.Give another adjective,beginning with the letter C,that refer ...continues

Isooctane problem: balanced combustion equation, standard volume, heat of combustion

Isooctane, C8H18, is the component of gasoline from which the term octane derives. A) Write a balanced equation for the combustion of one mole of isooctane to yield CO2(g) and H2O(l). B) What is the volume (in liters) of CO2 at STP? C )The standard molar heat of combustion (delta Hrxn for the reaction is -5,456.6 kJ/mol. Calc ...continues

Mole Concept, molecules in a drop of water

How many molecules are contained in one drop (0.050 mL) of water (density 1.0 g/mL)?

Percent Composition / Composition by mass

What is the mass percent of all the elements in Sodium bicarbonate (NaHCO3)?