22 23 24 25 26 27
141-225
28 29 30
B
2020 Wednesday
D
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show that
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ZAB?
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The mole, with symbol mol, is the SI unit for the quantity amount of substance. It is currently defined as follows:
The mole is that amount of substance that contains the same number of elementary entities as there are atoms in 12 g of carbon 12.An urn B1 contains 2 white and 3
black chips and another urn B2
contains 3 white and 4 black chips,
One urn is selected at random and a
chip is drawn from it. If the chip
drawn is found black, find the
probability that the urn chosen was
B1.
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