If law of constant composition is true, what weights of calcium, carbon and oxygen are present in 1.5 g fo calcium carbonate? Given that a sample of calcium carbonate from another sample contains the following percentage composition:
Ca = 40.0%;   C = 12.0%;  O= 48.0%

The following data were obtained when dinitrogen and dioxygen react together to form different compounds:

Mass of dinitrogen               Mass of dioxygen
(i) 14g                                              16g
(ii) 14g                                             32g
(iii) 28g                                            32g
(iv) 28g                                            80g

which law of chemical combination is obeyed by the above experimental data? Give its statement?

Carbon and oxygen are known to form two compounds. The carbon content in one of these is 42·9% while in the other it is 27·3%. Show that this data is in agreement with the law of multiple proportions. 

Define the law of reciprocal proportion. Explain with suitable examples.

Show that the law of reciprocal proportions is proved by the following results:
1·4g of the element A is known to combine with 1·6g of element B, while 0·5g of another element C combines with 3·5g of the element A and 2·857g of the element C combines with 22·857g of element B.

Two volumes of hydrogen combine with one volume of oxygen to produce two volumes of steam. Show that this illustrates Gay Lussac’s law.

Give various postulates of Dalton's atomic theory.

What are the limitations of Dalton's atomic theory?