A mixture of 2 x 10^21 molecules of P and 3 x 10^21 molecules of Q weighs 0.60 g. If the molecular mass
of P is 45, the molecular mass of Q will be (NA = 6 x 10^23)
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ANSWER
Let the mass of P=x gm
Mass of Q=(0.6−x) gm
Now, for P number of molecules
2×10
21
=
M
w
×N
A
=
45
x
×6×10
23
x=
6×10
23
2×10
21
×45
=0.15 gm
Mass of Q=(0.60−0.15) gm=0.45 gm
For Q
molecular mass of Q
0.45
×6×10
23
=3×10
21
M.M of Q=
3×10
21
0.45×6×10
23
=90
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