When gaseous nitrogen and gaseous hydrogen are reacted at high temperatures in the presence of a catalyst, ammonia (and no other product) is formed. If a chemical plant has to synthesize 450 kg of ammonia, what mass (in kilograms) of hydrogen has will be required, assuming 100% yield? (Use molar masses: hydrogen = 10 and nitrogen = 14,0 g/mol.) Give your answer to 2 significant figures. In the precipitation reaction: AlCl3(aq) + 3 NaOH(aq) – AKOH)3(s) + 3 NaCl(aq), what volume of 0.200 M NaOH(aq) solution would be required to react completely with 25.0 mL of a 0.100 M solution of AlCl3(aq)?
a) 150.0 mL
b) 12.5 ml
c) 4.2 ml
d) 37.5 mL