What Reactants are needed for photosynthesis? Glucose and Oxygen

Carbon Dioxide and Water

Water and Oxygen

Carbon Dioxide and Oxygen

Can someone me with questions 12 and 13 plz.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

Find the mass, in grams, of 5.00*10^23 molecules of f2