How many moles of sodium cyanide (nacn) would be needed to produce 4.2 moles of sodium sulfate (na2so4)? h2so4 + 2nacn ? 2hcn + na2so4

i think   the answer is c hope i'm right

i wish i could but this one is weird give me abc and i can solve it.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.