Question: How many atoms makes a washing machine

Philip Ratcliffe answered on 19 Nov 2014:

I think I answered something like this earlier.
Anyway, the definition of Avogadro’s number (6×10^23 or 6 followed by 23 zeros) is that it’s the number of atoms in 12 grams of carbon- 12. Let’s say a washing machine weighs about 100kg and that on average it’s made of stuff not so different from C12, then we have to multiply Avogadro’s number by 100×1000/12, which is not much less than 1000. So we get (very) roughly 6×10^26 or 6 followed by 26 zeros.
So the rule is that we multiply Avogadro’s number by the weight of the object in grams divided by 12.