# How much gas will be produced at 0 deg centigrade and 760 mm of pressure when 10g of oxalic acid was heated with concentrated sulphuric acid?

+1 vote
9.5k views
in JEE
edited
How much gas will be produced at 0 deg centigrade and 760 mm of pressure when 10g of oxalic acid was heated with concentrated sulphuric acid?

by (65.3k points)

Oxalic acid when heated with Concentrated sulphuric acid, decompose into carbon dioxide, carbon monoxide and water.

Sulphuric acid is a dehydrating agent.

According to the reaction, 1 mole of oxalic acid produce 1 mole of CO2 and 1 mole of CO gas.
Molar mass of oxalic acid (C2H4O2) = 126.03 g/mol     ( oxalic acid is always present as dihydrate C2H4O2.2H2O in solid state)
Number of moles of oxalic acid in 10g = 10126.03= 0.079 moles

Thus according to the reaction 0.079 moles of CO and 0.079 moles of CO2 will be produced.
Now at STP (00 celcius and 760 mmHg pressure) 1 mole of gas will occupy volume = 22.4 L
​Thus volume of 0.079 mole of  a gas = ​22.4×0.079 L
= 1.77 L
Thus there will be 1.77 L of CO2 and 1.77 L of CO gas.

Thus total volume of gas will be 3.54 L.

+1 vote