How many grams are of sodium chlorate are present in a 2.45 mole sample?

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.

Explanation:

I hope this helps!!

260 grams sodium chlorate

Explanation:

moles to grams multiply by formula weight.

grams to moles divide by formula weight.

sodium chlorate => NaClO₃

=> formula wt = Na + Cl + 3O = [1(23) + 1(35) + 3(16)]g/mole = 106g/mole

∴ grams NaClO₃ = 2.45 mole x 106 g/mole = 259.7 grams ≈ 260 grams  

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)