Question

find the mass of
(a) 2 mole of oxygen gas :-
(b) 15 mole of water:-
(c) 3moles of neon:-
(d) 5 miles of sodium:-
(e) 2 moles of nitrogen element:-​

Answer 1

Answer:

(a) 1 mole weigh 32 g

so 2 mole weigh 64 g

(b) 1 mole weigh 18 h

so 15 mole weigh 270 g

(c) We know, molar mass of neon ( mass of one mole of neon) = 20 gram. Hence, mass of 3 mole of neon = 3 × 20 = 60 gram.

(d) I mole Na weigh 23 g

5 mole weigh 115 g

(e) 1 mole weigh 28 g

2 mole weigh 56 g

It's easy to find the molecular mass of a compound with these steps:

Determine the molecular formula of the molecule.Use the periodic table to determine the atomic mass of each element in the molecule.Multiply each element's atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula.Add these values together for each different atom in the molecule

Hope it helps you

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Answer 2

Explanation:

a.mass 32 g

b.270 g

c.63g

d.115g

e.30g