How many in^2 in the 1.2ft^2

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal