Respuesta :
Answer:
1.2 g
Explanation:
Data Given:
mass of Ag = 3.98 g
mass of Cu = ?
Reaction Given:
Cu + 2AgNO₃ --------→ Cu(NO₃)₂ + 2Ag
Solution:
To solve this problem we have to look at the reaction
Reaction:
Cu + 2AgNO₃ --------→ Cu(NO₃)₂ + 2Ag
1 mol 2 mol
from reaction we come to know that 1 mole of Cu give 2 moles of Ag
Now Convert moles to mass
Molar mass of Cu = 63.5 g/mol
Molar mass of Ag = 107.9 g/mol
So,
Cu + 2 AgNO₃ --------→ Cu(NO₃)₂ + 2Ag
1 mol (63.5 g/mol) 2 mol ( 107.9g/mol)
63.5 g 215.8 g
So if we look at the reaction 63.5 g of Cu gives 215.8 g of Ag, then how many g of Cu will be Produce by 3.98 g of Ag
For this apply unity formula
63.5 g of Cu ≅ 215.8 g of Ag
X g of Cu ≅ 3.98 g of Ag
By Doing cross multiplication
mass of Cu = 3.98 g x 63.6 g / 215 g
mass of Cu = 1.2 g
1.2 g of Cu will produce 3.98 g of Ag
