How many particles are in 8.00 L of O2 at 15°C and 720. mm Hg. (use the coefficient - 1 decimal place in the first blank and the superscript in the second blank)
x10^

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

the answer for sodium is 0.186

the answer for rubidium is 0.251

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them