Question

Calculate the number of moles and molecule of urea in `5.6g` of usea.State Aulbau principle and the order of filling atomic orbitals following Auibau principle.​

Answer 1

Solution:

• No: of moles = weight / gram molecular weight

Given: Weight = 5.6g

• The molecular formula of urea: CO(NH₂)₂

Molar mass = {12 + 16 + 2 × (14 + 2 ×1) g/mol = 60 g/mol

• 60 g urea = 1 mole urea
• 5.6 g urea = ? (Say 'n')

By cross multiplying the above two equations

We get,

                 n = 5.6/60

                  n = 0.0933 mole urea.

• 1 mole urea = 6.022 × 10²³ molecules urea

• 0.0933 mole urea = 6.022 × 0.0933 × 10²³ = 5.62 × 10²² molecules of urea.

Answer:

Number of moles of urea = 0.0933

Number of molecules of urea = 5.62 × 10²²

Hope, this helps.

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