10 liters of water contains 3.3 x 10 ^ 26 molecules. How many molecules are there in a volume of 0.001 ml?
| September 9, 2021 | education
V1 = 10 HP
N1 = 3.3 * 10 ^ 26.
V2 = 0.001 ml = 0.001 * 10 ^ -3 L.
N2 -?
The concentration of molecules n is the ratio of the number of molecules N to the volume they occupy V.
n = N1 / V1.
n = N2 / V2.
N1 / V1 = N2 / V2.
N2 = N1 * V2 / V1.
N2 = 3.3 * 10 ^ 26 * 0.001 * 10 ^ -3 l / 10 l = 0.0033 * 10 ^ 23 = 3.3 * 10 ^ 20.
Answer: the number of N2 molecules = 3.3 * 10 ^ 20.
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