Answer:
D is the best choice. Those percentages, are giving you the information about how concentrated are the solutions. As 0.015 is so concentrated, this solution will damage the structures more quickly
Explanation:
hydrogen and oxygen I believe
Explanation:
I'll give you a real answer later need points for test questions sorry
Answer:

Explanation:
Hello!
In this case, since we have 245 of iron (III) oxide, we first need to compute the moles contained there:

Now, as 1 mole of iron (III) oxide is related to 2 moles of iron, due to iron's subscript in the molecule, we get the moles of iron itself:

And the mass is computed based on the atomic mass of iron:

Best regards!
Answer:
4.002602
Explanation:
the average that reflects the typical ratio of natural abundances of its isotopes.