Formulas for compounds?please help!?

Question

please help! can you write the formulas for these compounds?

a. rubidium nitrite

b. potassium sulfide

c. perbromic acid

d. magnesium phosphate

e. calcium hydrogen phosphate

f. boron trichloride

g. iodine heptafluoride

h. ammonium sulfate

i. silver perchlorate

j. iron (III) chromate

k. calcium sulfate dihydrate

well appreciated!

Answer 1

A.RbNO2

B.K2S

C.HBrO4

D.Mg3(PO4)2

E.CaHPO4

F.BCl3

G.IF7

H.(NH4)2SO4

I.AgClO4

J.Fe2(Cro4)3

k.CaSO42H2O