Chemistry Questions (rating:easy)

[psychlaw]

also its calcium hydroxide not calcium oxide :S

[Mao]

what exactly do u mean by

n (c2h2) = n(CaC2) = 1.248 mol?

I think im lost because there arent any numbers or answers =/

previous post updated

[psychlaw]

(calcium oxide is slightly soluble)





since the number of moles of water is more than double that of calcium carbide, calcium carbide is our limiting reactant:

stoichiometry: the mole ratio of ethyne to calcium carbide (from the equation) is 1:1, hence

Wrong Answer is 32.5 But your steps are right, just misadded the Molar mass of C2H2. I get it now anyway except this new question (still easy)


Calcium Oxide and Carbon react to produce calcium carbide, CaC2, and carbon monoxide. What is the maximum mass(that part confuses me) of calcium carbide that can be obtained from 40 kg of calcium oxide and 40 kg of carbon?

[Mao]

n(CaO)=40000/(40.1+16)=713 mol
n(C)=40000/12=3333 mol (more than 3 times that of CaO, hence CaO is the limiting reactant)

n(CaC₂) = 713 * (40.1+12*2) = 45.7kg

maximum mass in this case, I think, refer to the theoretical yield, i.e. the reaction proceeds to completion rather than equilibrium. [you don't need to know that yet]
for the purposes of unit 2 [and 3 for that matter], all of the reactants react to form as much product as possible [except for the species in excess]

[psychlaw]

Anyone help with this... its a toughy

In the blast furnace, iron and carbon dioxide are formed from the reaction between iron (III) oxide and carbon monoxide, which itself is formed from the reaction between Coke (C) and oxygen. What is the maximum mass of iron that can be obtained from 700 tonnes of iron (III) oxide and 70 tonnes of coke?

[Mao]

and



(i think...)