2NaN3 → 2Na + 3N2. Calculate the mass of sodium azide required to decompose and produce the 15.367 of moles of nitrogen . Refer to the periodic table to get the atomic weights.

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.