Posted by Hannah on Sunday, September 11, 2011 at 6:25pm.
pm is a very small unit, smaller than a head lice. 1 m=10^9 pm, which is the same as 1pm is 10^-9 m
numberatoms*diatmeter atom=1.4mm
numberatoms*131pm=1.4mm
change both to m
numberatoms*131pm*1m/10^9pm)=1.4mm(1m/10^3mm)
number atoms= 1.4*10^9/(131*10^3)
number atoms=1.4 (10^6)/131=1.07*10^4
check that.
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