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Finger [1]
2 years ago
6

How many moles of oxygen are prosent in 169 of oxygen gas?​

Chemistry
2 answers:
pashok25 [27]2 years ago
8 0

Answer:

number of moles = mass / molar mass

since oxygen is diatomic

molar mass =16*2

number of moles= 169/ 16 *2

number of moles= 169/32

number of moles= 5.28125

slamgirl [31]2 years ago
6 0

Answer:

Number of moles=Mass/ Molar Mass 169g÷32g/mol= 5.281 mol

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The first dissociation for H2X:
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initial                0.15                     0      0
change             -X                     +X      +X
at equlibrium 0.15-X                  X        X
because Ka1 is small we can assume neglect x in H2X concentration
     Ka1      = [HX][H3O]/[H2X]
4.5x10^-6 =( X )(X) / (0.15)
X = √(4.5x10^-6*0.15) 
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∴[HX] & [H3O] = 8.2x10^-4
the second dissociation of H2X
        HX + H2O↔ X^2 + H3O
    8.2x10^-4          Y         8.2x10^-4
Ka2 for Hx = 1.2x10^-11
Ka2       = [X2][H3O]/[HX]
1.2x10^-11= y (8.2x10^-4)*(8.2x10^-4)
∴y = 1.78x10^-5
∴[X^2] = 1.78x10^-5 m


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