First find the moles
moles of the calcium= 72.8 / 40
moles of calcium in 72.8g = 1.82mol
number of atoms= moles x Avogadro constant
atoms = 1.82 x 6.02x10+23
so the number of atoms is 1.096x10+24
Answer:
A. displacement) الازاحة
B. المسافة الفعلية للسيارة distance
You will calculate speed from graph (B) because it's the real distance, but (a) is Unreal distance
(II) speed equal distance / time
Speed =(250*1000/5*60*60).
=13.9888888m/s
Transportation seems like the right answer
Answer:
because it has lighter molecules.
Kilo: a prefix used on metric units to indicate a multiple of 1000. For example 1kg = 1000 g
