Question

1. How many grams are contained in 2.00 mol of neon atoms

2. Calculate the number of moles of sulfur represented by 1.81x10 24exponent atoms of sulfur

3. 3.4x10-5exponent moles of Na2co3 to grams

Answer 1

1)

Given

No. of moles = 2 mol

Molar mass of Neon = 20 g/mol

mass of Neon = No. of moles * Molar mass of Neon = 2 mol * 20 g/mol = 40 g/mol

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2)

Given

No. of atoms of sulfur = 1.81 * 10²⁴ atoms

No. of moles of sulfur = No. of atoms of sulfur / avagadro number = 1.81 * 10²⁴ atoms / 6.023 * 10²³ = 3 moles

No. of moles of sulfur = 3 moles

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3)

Given

No. of moles of Na2CO3 = 3.4 * 10^-5 moles

Molar mass of Na2CO3 = 106 g/mol

Mass of Na2CO3 = 3.4 * 10^-5 moles * 106 g/mol = 3.71 * 10^-3 g answer