Calculate the heat energy in kJ, required to evaporate 50.0g of water at 100 degrees celcius

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

H2o is a single atom of wat true or false?