How many significant figures does 0.00003 have?

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

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)

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added