Dissolving 3.00 g of an impure sample of calcium carbonate in
hydrochloric acid produced 0.656 L of carbon dioxide at
20.0°C and 792 mmHg.
CaCO3(s) + 2HCl(aq) = CaCl2(aq) + CO2(g) + H2O(1)
Calculate the percent by mass of calcium carbonate in the
original sample

What is the molar mass of ca(cio4)2

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

How many moles are contained in 5.6 l of h2 at stp