Because Air itself is not an element. it is made up by different elements such as Oxygen and nitrogen. since its made up of a mix of different elements, its rather a homogeneous mixture :)
Zinc (Zn) always has a +2 charge. It is one of the exceptions.
Answer:
0.17 lb
Explanation:
78 g * (1 lb/454 g)=0.17 lb
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Mole ratio for the reaction is 1:1
no of moles in NaOH that reacted= 1*21.17/1000=0.02117mols
molarity of HCl=0.02117*10/1000
=2.117M