Specific heat of water is `4.2 J//g.^(@)C`. If light of frequency `3 xx 10^(29)Hz` is used to heat 400 g of water from `20^(@)C` to `40^(@)C`, the number of moles of photons needed will be

Specific heat of water is 4.2 J//g.^(@)C . If light of frequency 3 xx 10^(29)Hz is used to heat 400 g of water from 20^(@)C to 40^(@)C , the number of photons needed will be

the water equivalent of a calorimeter is 50g . This calorimeter is used to heat 100 g of water from 10°C to 60°C . Amount of heat required to do this is

the water equivalent of a calorimeter is 50g . This calorimeter is used to heat 100 g of water from 10°C to 60°C . Amount of heat required to do this is

The specific heat capacity of water is 4.2 J g^(-1)C^(-1) . What does this statement mean?

Specific latent heat of vaporization of water is 2.26 xx 10^6 J//kg . Calculate the energy needed to change 5.0 g of water into steam at 100^@C

Latent heat of fusion of ice is 6.02 Kj "mol"^(-1) . The heat capacity of water is 4.18 J g^(-1) C^(-1) , 500 g of liquid water is to be cooled from 20^(@) C to 0^(@) C. Find the number of ice cubes (one mole each) required.

Ice in a freezer is at –7^(@)C . 100 g of this ice is mixed with 200 g of water at 15°C. Take the freezing temperature of water to be 0°C, the specific heat of ice equal to 2.2 J//g .^(@)C , specific heat of water equal to 4.2 J//g .^(@)C , and the latent heat of ice equal to 335 J/g. Assuming no loss of heat to the environment, the mass of ice in the final mixture is closest to

Specific latent heat of vaporization of water is 2.26 xx 10^6 J/kg. Calculate the energy needed to change 5.0 g of water into steam at 100^@ C