Ile gramów, ile moli i jaka objętość azotu (przeliczona na warunki normalne) przereaguje z 8,1g magnezu z utworzeniem Mg3N2 (wzory i obliczenia :) )
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M(N2)=2*14g/mol=28g/mol
M(Mg)=24g/mol
N2 + 3Mg -->Mg3N2
xg----8,1g
28g---3*24g
xg=28g*8,1g/72g
xg=3,15g
n-liczba moli
n=m/M
n=3,15g / 28g/mol
n=0,11mola
28g---------------22,4dm³
3,15g-------------xdm³
x=3,15g*22,4dm³/28g
x=2,52dm³
N2 + 3Mg -----> Mg3N2
72g Mg ---- 22,4dm3 N2
8,1g Mg --- X
X=2,52dm3 N2
72g Mg --- 1 mol N2
8,1g Mg --- X
X=0,1125 mola N2
72g Mg --- 28g N2
8,1g Mg --- X
X=3,15g N2