Question

What is the total mass of NO produced when 253 grams of copper react?


3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O



5.70 g

3.98 g

179 g

79.7 g

Answer 1

d 79.7 gm will be answer

Answer 2

3 mole Cu forms= 2 mole NO

3.9 mole(253÷63.5) CU fom= 2/3 ×3.98

= 7.96/3= 2.64 moles of NO

moles of NO=Given mass÷ molar mass

2.64 = mass÷ 30

so mass = 2.64×30

= 79.2

this is ur answer