WAEC - Physics (2002 - No. 21)
Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
113,000J
117,200J
234,400J
420,000J
ব্যাখ্যা
mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260
= 117,200J
= 117,200J