Chemistry: BCA chemical reactions

Question

Make a BCA table using the chemical reaction below and determine how many molecules of H2O

and O2 would be formed from 2.5x1022 molecules of H2O2.

2 H2O2(g) → 2 H2O(g) + O2(g)

Calculate the mass of O2 gas formed in question 1 from your BCA table.

Calculate how many liters of H2O gas at STP are formed in question 1 from your BCA table.

Answer 1

2 H2O2(g) ==> 2 H2O(g) + O2(g)

2x10²² molec.... 0................0....................B

-2x10²² molec...+2x10²²....+1/2 2x10²²...C

0.........................2x10²².......1x10²²..........A

mass of O2 = 1x10²² molecules O₂ x 1 mol O₂/6.02x10²³ molecules x 32 g/mole = 0.53 g O₂

Liters H₂O @STP = 2x10²² molecules x 1 mol H₂O/6.02x10²³ molecules x 22.4 L/mol = 0.75 L H₂O gas