Combustion analysis of 1.621 g of an unknown compound containing only carbon, hydrogen and oxygen produced 3.095 g of CO2 and 1.902 g of H20.
What is the molecular formula of the compound if the Mr of this compound known to be 138.1?

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

+= + + balance the equation on coefficients, ex. 1,1,1