27g of Aluminium
Explanation:
For Zachary tasked with obtaining one mole of aluminium, weighing 27g of the compound gives 1 mole of the element.
A mole is a simple unit of quantifying particles of a substance.
It is the amount of substance that contains the avogadro's number of particles.
The molar mass of a substance is the mass in gram of one mole of a substance.
The molar mass of Aluminium is 27g/mol
This is implies 1 mole aluminium has a mass of 27g.
Mass = number of moles x molar mass = 1 mole x 27g/mole = 27g
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Ca(OH)2 -------> CaO + H2O
ratio is 1 : 1
CaO Mr= 56g
15/56 = 0.268 mol (mols of CaO in 15g)
Ca(OH)2 Mr= 74g
0.268x74= 19.83g (required amount of Cash(OH)2)
Explanation:
NiCl2 + KOH = NiOH + KCl
since nickel is the primary element in nickel ii chloride, find the oxidation no of nickel in the compound and chlorine should have 2 as a subscription since the ii in the compound represents that nickel has an oxidation no of 2