if you have 0.15 moles P4 molecules, then
(1) how many P4 molecules do you have ?
(2) How many P atoms do you have ?
(3) How many moles of P atoms do you have in the sample ?
Answers
Explanation:
Molar mass = P x 4
= 31 x 4
= 124
No of moles = 0.15 mol
N = W÷M
3 = W÷124
3 x 124 = W
W = 426 g
Therefore, the mass of the substance is 426 g
To calculate no of molecules
No. of molecules = no of mole x Avagadro No
= 0.15 x 6.023 x 10^23
= 0.90345 x 10^23.
Therefore, the number of molecules present in Phosphorus.
Now to calculate the no of atoms
No of molecules = no of moles x Av
= 0.15 x 6.023 x 10^23
= 0.90345 x 10^23
No of atoms = no of molecules x atomicity
= 0.90345 x 10^23 x 4
= 3.6138 x 10^23.
Therefore, the atoms present in P4 = 3.6138 x 10^23
No of moles = W÷M
= 426÷124
= 3.4354 mol
Therefore, the no of moles in the sample is 3.4354 mol
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