How many moons will it take to equal the mass of the earth in grams?

Answer 1

The first thing to say is, it doesn't matter if it's in grams or tons or whatever, the ratio (one divided by the other) will be the same.

The second is that this is easy to do yourself, so you may as well.

Go to the Wikipedia article on the moon. It lists the moon's mass. In fact, it even gives the moon's mass in terms of Earth's mass (which saves you the trouble of having to look up the Earth's mass). You want the reciprocal of the moon's mass in Earths - where it says for mass "7.3477 × 1022 kg (XXX Earths)" you want 1 divided by the XXX. The answer should be good to about two significant figures, so if the answer is "73.85341" (it isn't) then just say "74".