A student starts a reaction with 2.5 g H2 and 2.5 g N2. The balanced reaction is given below. Answer the questions that follow.
molar mass (g/mol): H2: (2.02) N2: (28.02) NH3: (17.04)
3 H2 (g) + 1 N2 (g) → 2 NH3 (g)

a) Which is the limiting reactant? Why? Justify your answer showing
necessary calculations

b) What is the theoretical yield of NH3 in grams?

__can be defined as which velocity changes

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o