Question

Calculate the number of moles and number of molecules present in 1.89g of nitric acid(HNO3) ​

Answer 1

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Answer:

Nitric acid formula = HNO3

Mass of Nitric acid = 1 + 14 + 16 x 3 Amu = 63 Amu

begin gathered moles = frac given mas molecular mass frac 1.89g 63amu 0.03 moles number of molecules = moles times avogadro number 0.03 times 6.023 times 10 ^23 = 0.18069 times 10 ^23 1.8069 times 10 ^22 moleculesend gathered

moles=

molecularmass

givenmass

63amu

1.89g

=0.03moles

numberofmolecules=moles×avogadronumber

0.03×6.023×10

23

=0.18069×10

23

1.8069×10

22

molecules

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