Acidic oxides such as carbon dioxide react with basic oxideslike calcium oxide (

Question

Acidic oxides such as carbon dioxide react with basic oxideslike calcium oxide (CaO) and barium oxide (BaO) to form salts(metal carbonates). a) Write equations representing these tow reactions b) A student placed a mixture of BaO and CaO of combined mass4.88 g in a 1.46 L flask containing carbon dioxide gas at 35degrees Celcius and 746 mmHg. Calculate the percentcomposition by mass of the mixture. Assume volumes of the solidsare negligible. Acidic oxides such as carbon dioxide react with basic oxideslike calcium oxide (CaO) and barium oxide (BaO) to form salts(metal carbonates). a) Write equations representing these tow reactions b) A student placed a mixture of BaO and CaO of combined mass4.88 g in a 1.46 L flask containing carbon dioxide gas at 35degrees Celcius and 746 mmHg. Calculate the percentcomposition by mass of the mixture. Assume volumes of the solidsare negligible.

Explanation / Answer

a.) CaO+CO2--->CaCO3
BaO +CO2 --->BaCO3
b) By using the gas law PV=nRT

the initial moles of CO2 is 0.0567. Final moles of CO2 is0.0192
moles of CO2 consumed are 0.0375
CaO & BaO react in a 1:1 ratio with CO2
let the moles of CaO & BaO be x & y respectively.
then forming an equation

x + y =0.0375          --------------------------(1)

mol. wt. of CaO is 56 & of BaO is 153.Total mass of mixture is4.88 g.Thus writing equation for mass

56x + 153y =4.88             -------------------(2)

Solving the equation simultaneously,
x = no. of moles of CaO = 0.0088
y = no. of moles of BaO = 0.0287

wt. of CaO = 56x = 0.4928 g
wt. of BaO = 153 y = 4.3911 g

% CaO = 10.09 %
% BaO = 89.91 %

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