Oxygen (O2)(O2) has a molar mass of 32.0 g/molg/mol . Part A What is the root-mean-square speed of an oxygen molecule at a temperature of 301 KK

Can someone me with questions 12 and 13 plz.

Which metal exist in liquid state and can be cut with knife ?

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