How long would it take for 0.25g to remain of a 1.00g of iodine 125

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2