53. Two atoms are found to contain the same number of neutrons. Can we use this information to determine that they are the same element? Explain.
58.
How does the mass number and the atomic mass given on the periodic table differ?
59. Cu is an isotope of Copper; what is the atomic number and the atomic mass
number?

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign