2.0 g of a metal burnt in oxygen gave 3.2 g of its oxide . 1.42 g of the same metal heated in steam gave 2.27 of its oxide . Which law is varified by these data ?

In an experiment, 2.16 g of copper was dissolved in nitric acid followed by ignition of the nitrate, which gave2.70 g of copper oxide. In another experiment, 1.46 g of copper on heating in a current of air gave 1.83 g of copper oxide. The percentage of copper in copper oxide is______ and the above data illulstrate the law of _________.

50 g of copper is heated to increase its temperature by 10^@C . If the same quantity of heat is given to 10 g water, the rise in its temperature is Specific heat of copper = 420 joule-kg^-1^@ C^-1 , Specific heat of water = 4200 joule-kg^-1^@ C^-1

Which one of the alkali metals forms only the normal oxide, M_(2)O , on heating in air ?

1 g of water at 100^@C is coverted into steam at the same temperature. If the volume of steam is 1671 cm^2 , find the change in the internal energy of the system. Latent heat of steam = 2256 Jg ^-1 . (1 atmosphere pressure = 1.013 xx 10^5 Nm^-2 )

A solid of mass 250 g at 90^@C is dropped in a calorimeter containing 100 g of water at 15^@c .The resulting temperature of mixture becomes 40^@C The mass of calorimeter is 100 g and its specific heat capacity is 0.1 cal//g^@C . Find the specific heat capacity of the solid

Practice problems : A metal weights 0.54 kg in air . If its density is 2.7 g/cc , what will be its weight in water ?

A calorimeter of mass 50 gm and specific heat capacity 0.42 J g^-1 ^@C^-1 contains some water at 20^@ C. A metal piece of mass 20 gm at 100^@ C is dropped into the calorimeter. After stirring, the final temperature of the mixture is found to be 22^@C .Find the mass of water used. (specific heat of metal piece= 0.3 J g^-1 ^@C^-1 specific heat of water = 4.2 J g^-1 ^@C^-1 )

1 g of water at 100^(@)C is completely converted into steam at 100^(@)C . 1g of steam occupies a volume of 1650cc. (Neglect the volume of 1g of water at 100^(@)C ). At the pressure of 10^5N//m^2 , latent heat of steam is 540 cal/g (1 Calorie=4.2 joules). The increase in the internal energy in joules is

A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88 A. The density of the metal is 7.20 g/cm^3 . How many unit cells will be there in 100 g of the metal?

20.2 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (At wt Mg=24 )