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A 12-gram mixture of methane, CH4, and ethane, C2H6, is completely combusted in oxygen. If the total mass of H2O produced is 23.4 grams, what was the approximate mass of the methane in the original mixture?
a.6g CH4
b.8g CH4
c.4g CH4
d.5g CH4
Calculating the rate of disappearance of HCl, The rate of disappearance of HCl was measured for the following reaction
A laser pulse with wavelength 555 contains 4.40 of energy. How many photons are in the laser pulse?
Given mass of a gas 0.26g, pressure is 763mmHg and volume of 147mL.by using an ideal gas law calculate the molar mass of the gas
which of the following shows the acids in order from strongest to weakest? The order of atomic radii is I > Br > Cl
The reaction 2NO (g)-> N2 (g) + O2 (g) has a H = 180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction?
what is the density of hydrogen sulfide at 1.2 atm and 307 K? answer in units of g/L
A green leaf has a surface area of 2.00 cm^2. If solar radiation is 1030 W/m^2, how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.
How many liters of O2 are needed to react completely with 45.0L of H2S at STP? 2H2S(g) + 3O2(g) -> 2SO2(g) +2H20(g)
Which of the following compounds would you expect to be ionic?
Calculate the equilibrium concentrations for all species: B. Calculate the value of the equilibrium constant, K.
A radiometric dating technique uses the decay of U-238 to Pb-206 (the half-life for this process is 4.5 billion years) to determine the age of the oldest rocks on Earth and by implication the age of Earth itself The oldest uranium-containing rocks..
Write and equation for the reaction of Ba+ with CrO4 2-. Using the eqution you have written, explain how the addition of HCl shifts the equilibrium of the reaction
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