Question

URGENT!!! 3.Calculează numărul de protoni şi neutroni din:
a. 16g 02
b.11,2Kg de Fe
c. 5 Kmoli de Mg
d. 2,24L de H​

Answer 1

Răspuns:

Explicație:

a. oxigen      Z=8    A=16      8p, 8e , 8n

16 g O

16 g O---------1 mol de atomi de O ----------------------6,023.10²³  atomi de O---

------ 8 .  6,023.10²³  p---- -----8 .  6,023.10²³ n

b.   Fe

Z= 26      A=56     26p,26e,30n

11,2 kg Fe= 11200 g Fe

n= 11200g : 56g/moli=200moli de atomi de Fe

1mol Fe-----6,023.10²³atomi Fe--------26  . 6,023.10²³  p----30 . 6,023.10²³n

200moli Fe    -----------------------------------------x----------------------------y

x= 200  . 26  . 6,023.10²³ p =

y= 200 . 30 .6,023.10²³ n =

c.

Mg

Z=12      A=24       12p , 12e , 12n

5kmoli=5000 moli

1mol Mg -------6,023.10²³atomi Mg------12 . 6,023.10²³ p-----12.6,023.10²³ n

5000 moli ------------------------------------------x----------------------------y

x=5000 . 12  . 6,023.10²³ p =3611380 .10²³ p

y=3611380. 10²³ n

d.

nH2= 2,24 L  : 22,4 L /moli=0,1 moli

H    Z=1    A=1      1p ,1e , 0 n

1mol H2----------6,023.10 ²³molecule H2----2 .6,023.10²³atomi H-----------------------------2 . 2 .6,023.10²³p-----------0 .2. 6,023.10²³ n

0,1 moli H2 ----------x-------------------------y

x= 0,1  .  2  . 2 .6,023 .10²³p =

y= 0

calculeaza , te rog , singur!