Question

what is the mass of 5 moles of sodium sulphide Na2SO4​

Answer 1

Answer:

630g

Explanation:

Na2SO3 =2× Atomic mass of Na+ atomic mass of sulphur +3× Atomic mass of O

=2×23u+32u+48u

=126u

therefore, for 5 moles= 5×126 g

=630 g

Answer 2

Answer:

710 grams

Explanation:

Mass of Na : 23

mass of S : 32

mass of O : 16

Na x 2 = 23 x 2 = 46u

S x 1 = 32 x 1 = 32u

O x 4 = 16 x 4 = 64u

Mass of 1 molecule of Na2SO4 = 46 + 32 + 64 u

= 142 u

Mass of 1 mole of Na2SO4 = 142 g

Mass of 5 moles of Na2SO4 = 142 x 5

= 710 g

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