Respuesta :
a) Molar mass gold ( Au) = 196.96 g/mol
1 mole Au ----------- 196.96 g
? moles Au ---------- 35.12 g
35.12 x 1 / 196.96
= 0.178 moles of Au
_____________________________
b) 196.96 g --------------- 6.02x10²³ atoms
35.12 g ---------------- ( atoms ? )
35.12 x ( 6.02x10²³) / 196.96
2.114x10²⁵ / 196.96
= 1.07x10²³ atoms
_____________________________________________
1 mole Au ----------- 196.96 g
? moles Au ---------- 35.12 g
35.12 x 1 / 196.96
= 0.178 moles of Au
_____________________________
b) 196.96 g --------------- 6.02x10²³ atoms
35.12 g ---------------- ( atoms ? )
35.12 x ( 6.02x10²³) / 196.96
2.114x10²⁵ / 196.96
= 1.07x10²³ atoms
_____________________________________________
Answer:
a) 0.1783 moles of gold.
b) [tex]1.074\times 10^{23} [/tex] atoms of gold.
Explanation:
Mass of gold sample = 35.12 g
Atomic mass of gold = 197 g/mol
Moles of compound = [tex]\frac{\text{mass of the compound}}{\text{molar mass of compound}}[/tex]
a) Moles of gold :'[tex]\frac{35.12 g}{197 g/mol}=0.1783 mol[/tex]
1 mole = [tex]6.022\times 10^{23}[/tex] atoms. molecule
b) Number of gold atoms in 0.1783 moles:
[tex]=0.1783\times 6.022\times 10^{23}=1.074\times 10^{23} atoms[/tex]