Iridium metal, Ir crystallizes as a fcc structure. The edge length of the unit cell was found to be 383,9 pm. The density of Ir is 22.42 g/cm3. Calculate the mass of an Iridium atom using the Avogadro number.

Its the second one nonmetals are moldable and easily shaped 

Hi + naoh -> h2o + nal

Answer is: value of q is 5·10⁻⁶m.chemical reaction: mg²⁺(aq) + co₃²⁻(aq) → mgco₃(s).c(mg²⁺) = 2.5·10⁻³ m; concentration of magnesium cations.c(co₃²⁻) = 2.00·10⁻³ m; concentration of carbonate anions.q = c(mg²⁺)  · c(co₃²⁻).q = 2.5·10⁻³ m  · 2.00·10⁻³ m.q = 5·10⁻⁶m.q = 0.000005 m.

Answerethyl pentanoate