Consider The Reaction (J)

Question

Consider the reaction

B₂H₆(g) + 3 O₂(g) → B₂O₃(s) + 3 H₂O(g) ∆H = -2035 kJ/mol

Calculate the amount of heat released when 43.6 g of diborane is burned. 

heat released =   kJ

Answer 1

Hello,

You need to calculate the mole amount of diborane that is burned;

Mol= Mass/Molar mass

Molar mass can be calculated as; (2x10.81) +(6x1)=27.62 g/mole

Mole= 43.6/27.62= 1.579 mole

Use the conversion factor to calculate amount of heat released by burning 1.579 moles of diborane as follows;

1.579 moles of diborane x (-2035 kJ/1 mole)= -3214/7 kJ