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If the reaction 4NH3 + 5O2 yeilds 4NO + 6H2O uses 824 g NH3 and excess oxygen, how many moles of NO are formed?
calculate the minimum energy a photon must have to produce an electron hole pair in an extrinsic semiconductor of band gap 1.3 electron volts.
A soft drink contains 35 mg. of sodium in 315g. of H2O. What is the concentration of sodium in the soft drink in mass percent?
In an airplane, a gas sample occurs at a volume of 1.5 L at 760.0 torr. Suppose, while flying, the airplane loses pressure and the volume of the gas increases to 11.40 L.
What would be the pH of 87 mL of the buffer to which 8.5 mL of 0.11 M hydrochloric acid has been added?
The element of area in two-dimensional Cartesian coordinates is dxdy ; a and b are constants. b. Normalize the wave function e^(-2r /b )
at 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa/s when 10.0 % had reacted and 7.67 Pa when 20.0 % had reacted.Determine the order of reaction.
How many grams of formic acid, HCOOH, must be added to 0.100 L of 0.130 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.40? Assume no volume change. Ka of HCOOH = 5.0 10-4.
A substance has a molar mass of 60 g/mol with 40.0 percent carbon, 6.7 percent hydrogen, and 53.3 percent oxygen. What is its empirical formula?
A mixture of gases containing 21.0 g of N2, 106.5 g of Cl2, and 12.0 g of He at 14 oC is in a 50.0 L container. What is the partial pressure of N2.
Determine the mass of RbCN required to prepare a 500 mL solution which is .12 M RbCN (MW = 112 g/mol).
A gas sample containing 1.47 mol at 25°C exerts a pressure of 401 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800. torr,
A 29.0-g sample of water at 260. K is mixed with 48.0 g water at 300. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
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