7. Borazon, one crystalline form of boron nitride, BN, is very likely the hardest of all substances. If one sample contains 3.02 X 1023 atoms of boron, how many atoms and how many grams of nitrogen are also in this sample? 8. If iodine is not in a person's diet, a thyroid condition called goiter develops. Iodized salt is all that it takes to prevent this disfiguring condition. Calcium iodate, Ca(IO3)2, is added to table salt to make iodized salt. How many atoms of iodine are in 0.500 moles of Ca(IO3)2? How many grams of calcium iodate are in 0.005mol of Ca(IO3)2?
add up the AMU of boron and nitrate, then use that crazy little concept of the mole. then the mass of boron is AMU of boron/total AMU. same goes for nitrogen. Note nitrogen != nitrate. nitrate has oxygen in it. same goes for the last question half a mole so it'd be 6/7ths of half a mole for the first part and then for the last part and then 1/7th of .005 mole. if you don't know what a mole is get memorizing ASAP.
