Question

1.
Cate grame de calciu sunt continute in 0.1 moli de atomi?
2
Calculati nr de atomo din 78 g potasiu
Urgent

Answer 1

n = m/M
M Ca = 40 g/mol
m = n*M = 0,1*40 = 4 g Ca

n = m/M
M K = 39 g/mol
n = 78/39 = 2 moli K
1 mol K................6,022*10^23 atomi K
2 moli K....................x
x = 12,044*10^23 atomi K