Short Answer TypeIf 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%
Long Answer TypeLaw of multiple proportions (John Dalton 1804) states that when two elements combine to form two or more compounds, the weight of one of the elements which combines with a fixed weight of the other, bears a simple whole number ratio. For example, hydrogen and oxygen combine to form two compounds H2O (water) and H2O2(hydrogen peroxide). In water, Hydrogen 2 parts and oxygen 16 parts In hydrogen peroxide hydrogen 2 parts and oxygen 32 parts.
The weights of oxygen which combine with same weight of hydrogen in these two compounds bear a simple ratio 1 : 2. Nitrogen forms five stable oxides:
N2O Nitrogen 28 parts Oxygen 16 parts
N2O2 Nitrogen 28 parts Oxygen 32 parts
N2O3 Nitrogen 28 parts Oxygen 48 parts
N2O4 Nitrogen 28 parts Oxygen 64 parts
N2O5 Nitrogen 28 parts Oxygen 80 parts
The weight of oxygen which combines with same weight of nitrogen in the five compounds bear a ratio 16 : 32 : 48 : 64 : 80 : or 1 : 2 : 3 : 4 : 5.
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.
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.
Short Answer TypeTwo volumes of hydrogen combine with one volume of oxygen to produce two volumes of steam. Show that this illustrates Gay Lussac’s law.
Long Answer Type
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