Silicon carbide, an abrasive, is made by the reaction of silicon dioxide with graphite. SiO2 + 3C SiC + 2CO
If 100 g of SiO2 and 100 g of C are reacted as far as possible, which one of the following statements will be correct?
(a) 111 g of SiO2 will be left over.
(b) 44 g of SiO2 will be left over.
(c) 82 g of C will be left over.
(d) 40 g of C will be left over.
(e) Both reactants will be consumed completely, with none of either left over.

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.