Question

Cu + 2AgNO3 + Cu(NO3)2 + 2Ag
How many grams of Cu react with 105.2 g of Ag?

Answer 1

Answer:

Mass of Cu react =31.14 g

Explanation:

Given data:

Mass of Cu react = ?

Mass of silver produced = 105.2 g

Solution:

Chemical equation:

Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂

Number of moles of Ag:

Number of moles = mass/ molar mass

Number of moles = 105.2 g/107.87 g/mol

Number of moles = 0.98 mol

Now we will compare the moles of Cu and silver from balance chemical equation:

Ag : Cu

2 : 1

0.98 : 1/2×0.98 = 0.49 mol

Mass of Cu:

Mass = number of moles × molar mass

Mass = 0.49 mol ×63.546 g/mol

Mass = 31.14 g

Step-by-step explanation:

Answer 2

Mass of Cu react =31.14 g

Step-by-step explanation:

Given data:

Mass of Cu react = ?

Mass of silver produced = 105.2 g

Solution:

Chemical equation:

Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂

Number of moles of Ag:

Number of moles = mass/ molar mass

Number of moles = 105.2 g/107.87 g/mol

Number of moles = 0.98 mol

Now we will compare the moles of Cu and silver from balance chemical equation:

Ag : Cu

2 : 1

0.98 : 1/2×0.98 = 0.49 mol

Mass of Cu:

Mass = number of moles × molar mass

Mass = 0.49 mol ×63.546 g/mol

Mass = 31.14 g