When heated, calcium carbonate decomposes with the release of gas. This is the s

Question

When heated, calcium carbonate decomposes with the release of gas. This is the same gas that is released when calcium carbonate reacts with an acid. What is the chemical formula of the gas? The heat of vaporization of benzene, C_6 H_6, is 393 J/g at its boiling point of 80.1 degree C. How much energy in the form of heat is required to vaporize 102 g benzene at its boiling point? Calculate mass, in gram, of a sample of Mg that contains 9.28 times 10^24 of atoms. Calculate the mass percentage of Ca in CaBr_2. A gas in a sealed flask exhibits a pressure of 1.000 atm at a temperature of 25 degree C. What is the pressure in the flask if the gas is heated to 100 degree c

Explanation / Answer

(17)

CaCO3 (s) -----Heating----> CaO (s) + CO2 (g)

CaCO3 (s) + 2 HCl (aq.) ------------> CaCl2 (aq.) + H2O (l) + CO2 (g)

So, the gas released = CO2, carbondioxide

(18)

Heat required to vaporize 102 g. of benzene = 102 * 393 = 40086 J = 40.1 kJ

(19)

Mass of 1 mol of atoms i.e 6.022 * 1023 atmos = 24 g.

Then, mass of 9.28 * 1024 atoms = 24 * 9.28 * 1024 / (6.022 * 1023) = 3.70 * 102 g.

(20)

Molar mass of Ca = 40 g/mol

Molar mass of CaBr2 = 40+2(80) = 200 g.

Mass % of Ca = (40/200) * 100 = 20 %

(21)

P1/T1 = P2/T2

1.000 / 298 = P2 / 373

P2 = 1.25 atm

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