What mass of water forms when 1.45*10^ -3 gO 2 react completely ? (Molar mass of O 2 =32.00 g / (mol) ; molar mass of H 2 O=18.02 g/mol)

Express the following number in scientific notation. 0.026890 =

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)

At element makes up all organic compounds?