Afla nr. de nucleoni din 4 moli de litiu.
Numarul de protoni din 46 kg de sodiu.
Numarul de electroni din 2kmoli de potasiu.
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Răspuns
Explicație:
nocleoni : p si n
LI Z= 3 ----> 3e, 3p, 4n
A=7
1mol Li ---------6,022.10²³atomi Li-----3 . 6,022.10²³p---4 .6,022.10²³n
4moli Li-------------------------------------------------x----------------------y
x= 4 . 3 .6,022.10²³ p = 72,264.10²³ p
y= 4 . 4 . 6,022.10²³ n = 96,352 .10 ²³ n
46kg= 46000g Na
Na Z=11 ---> 11e, 11p , 12n
A=23
n= m : M
n= 46000g : 23g/moli= 2000 moli Na
1mol Na-------6,022.10²³ atomi--------11 . 6,022.10²³ p
2000moli Na----------------------------------------x
x= 2000 . 11 .6,022.10²³ p = 132,484.10²³ p
2kmoli K= 2000 moli K
K Z=19------> 19e,19p
1mol K ---------6,022.10²³ atomi K---------19 . 6,022.10²³e
2000moli K-----------------------------------------------x
x= 2000 . 19 . 6,022.10²³ e = 228,836 .10²³ e