Does anyone know how to solve this answer, like the method many thanks

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

How many atoms are there in 5.70 mol of mg