Carbon dioxide is added to 112g of calcium oxide. The product formed is 200g of calcium carbonate. Calculate the mass of carbon dioxide used. Which law of chemical combination will govern your answer. (AS-1)

The total number of protons in 10 g of calcium carbonate is (N_0 = 6.023 xx 10^23)

Carbon in carbon dioxide is radioactively labelled. The product in which radioactive carbon can be traced in C_(3) plants is

Carbon combines with hydrogen to form three compounds A, B and C. The percentage of hydrogen in A, B and C are 25, 14.3 and 7.7 respectively. Which law of chemical combination is illustrated ?

0.30 g of a substance gives 0.88 g of carbon dioxide and 0.54 g water. Calculate the percentage of carbon and hydrogen in it.

Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (Atomic mass of calcium = 40)

A mixture-of 1.5 gm calcium carbonate and magnesium carbonate is strongly heated form 360 ml of carbondioxide at S.T.P. calcualte the percentage composition of the mixture. [C = 12, M = 24]

Ammonia is combined with carbon dioxide to form urea in kidney.

Write down the thermochemical equations for the following reactions: (i) A 1 mol sample of methane gas reacts with 2 mol of oxygen gas to form 1 mol of carbon dioxide and 2 mol of water. In this reaction, 890.5 kJ of heat is produced. (ii) A 1 mol sample of carbon (graphite) reacts with 1 mol of oxygen tof orm 1 mol fo carbon dioxide gas. the heat evolved in this reaction is 393.5 kJ. (iii) 6 mol of carbon dioxide gas reacts with 6 mol of water to form 6 mol of oxygen gas and 1 mol of glucose. the heat absorbed in this reaction is 2200 kJ.

Which out of dil. H_2SO_4 , HCl and HNO_3 can be used in the preparation of carbon dioxide from PbCO_3 ?

Analysis of 30g of a compound D was found to contain 10g off element A and 20g of element B. again analysis of 45g of another compound E was found to contain 15g of element B and 30g of element C. caculate the amounts of D and E formed if 15g of A, 60g of B and 15g of C are mixed together and allowed to react with each other. also calculate total mass of the mixture after completion of the reaction. assume that no other reaction is possible except the reaction of B with A and C separately. state which laws of the chemical combination can be utilised in the calculation.