I can't tell because I can't see the picture but it seems like
Answer: 2) 0.21 mole H2O
3) 0.50 mole K2O
4) 123 g Ca( NO3)2
Explanation: solution attached.
For number 2 to find the number of moles of H2O just divide the given in molecules with the Avogadro's number.
For 3 convert grams of K2O to moles by using 1 mole of K2O is equal to the molar mass of K2O
For number 4 moles to grams. Same process with number 3
Answer: 1.91cm3
Explanation:
10.49g of silver dissolves is 1cm3 of solution.
Therefore 20g of silver will dissolve in = 20/10.49 = 1.91cm3 of the solution.
Answer: Chemical Elements List with atomic number and chemical symbol
Explanation:
I attached a Word document with the chemical elements list for easier use.
Notice that the elements are order by atomic number.
Cyclic AMP is the molecule that is created by the Adenylate cyclase.