Limestone, caco3, reacts with hydrochloric acid to form calcium chloride, water and carbon dioxide

according to the following reaction:

caco3(s) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g)

how many liters of co2 gas will be formed at 722 torr and 43.0°c by the reaction of 4.35 g limestone

with an excess of hydrochloric acid? assume 100% yield and that the gas is ideal.

Why does his teacher ask him to balance the equation by including the correct coefficient

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

)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.