Measuring specific latent heat of vaporization of water

The calculated value of the specific latent heat of vaporization was supposed to be 2.3 x 10.The accepted value of the latent vaporization heat is 2.3x 10.The median value of the calculated Latent heat of vaporization was modelled by the equation.The scientist determined the uncertainties by measuring them.Take the kettle and fill it up half way with water.When the water starts to boil start timing.Stop timing when 50 grams of water have been lost.Hopefully the results obtained will be similar to the accepted value.The reasons of such weak results were the uncertainties of the procedure, and old equipment.The scales that the scientist was usingwere three-beam, and not electronic.