How many moles are in 1.34 x 10^24 molecules of H2O

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Consider the equilibrium system: 2icl(s) ⇄ i2(s) + cl2(g) which of the following changes will increase the total amount of of cl2 that can be produced? all of the listed answers are correct decreasing the volume of the container removing the cl2 as it is formed adding more icl(s) removing some of the i2(s)