Jaką liczbę moli stanowi:
a. 20,6 g siarkowodoru H2S
b. 1,12 dm3 azotu N2 (warunki normalne)
c. 1,505 razy 10 do 23 potegi atomów miedzi
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a. 1 mol H2S - 34g
x mol H2S - 20,6g
x = 0,606 mol
b. 1 mol N2 - 22,4 dm^3
x mol N2 - 1,12 dm^3
x = 0,05mol
c 1 mol Cu - 6,02 * 10^23 at.
x mol Cu - 1,505 * 10^23
x = 0,25 mol
a)
M(H₂S)=34g/mol
34g --- 1mol
20,6g --- x
x=20,6g·1mol/34g≈0,6mola
b)
22,4dm³ --- 1mol
1,12dm³ --- y
y=1,12dm³·1mol/22,4dm³=0,05mola
c)
6,02·10²³ --- 1mol
1,505·10²³ --- z
z=1,505·10²³·1mol/6,02·10²³=0,25mola