18. why is an iron alloy, such as steel, preferred over pure iron?

what's the

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

fe 55.85 g/mol and h2o 18.02 g/mol.

the answer is 75.0%.