Question

calculate mass of water present in 499 gm CuSO4.5H2O

Answer 1

The answer is, 179.64 gm.

What defines atomic mass?

• Atomic mass, the quantity of matter contained in an atom of an element.
• It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of 12 units.
• In this scale, 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.

According to the question:

Atomic mass

Cu =>64g , S => 32g , O => 16g , H =>1g

Weight of 1 mole of CuSO4.5H2O = 64 + 32 + 16x4 + 5(1x2 + 16) = 250 gm

Weight of 1 mole of H2O = 1x2 + 16 = 18 gm

1 mole of CuSO4 contains 5 moles of H2O

Or, 250gm of CuSO4 contains 5x18 gm = 90

gm of H2O

Or, 1gm of CuSO4 contains 90/250 gm =

0.36 gm of H2O

Or, 499 gm of CuSO4 contains 0.36x499 gm

= 179.64 gm of H2O

Hence, the answer is 179.64 gm.

Learn more about atomic mass here,

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