How do I balance this
H2 + O2 = H2O

2 H2 + O2 = 2 H2O

Explanation:

H2 + O2 = H2O

- Left side: 2H and 2O

- Right side: 2H and 1O

Add a coefficient of 2 to the right side

H2 + O2 = 2 H2O

- Left side is still: 2H and 2O

- Right side now has: 4H and 2O

Add a coefficient of 2 to H2 on the left side

2 H2 + O2 = 2 H2O

- Left side still has: 4H and 2O

- Right side now has: 4H and 2O

2 H2 + O2 = 2 H2O is the balanced equation.

i think its 100.

hope this !

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.