Question

Which of the following weighs least? (Atomic mass: Al = 274, Ag = 108u, Cl = 35.50 )
O (a) 50 g of Fe
(b) 5 moles of oxygen atoms
O (c) 0.1 mole of silver
O (d) 6.022 x 1023 atoms of chlorine

Answer 1

0.1 mole of Ag

$\bf\huge\underline{\underline{ Answer :- }}$

• To get least mass , convert all of them into grams

5 moles of Oxygen atoms

• 5 mole O = 5 × 16

• 5 × 16 = 80 g

0.1 mole of Silver

• 0.1 × 108 = 10.8 g

6.022 × 10²³ atoms of Cl

• 6.022 × 10²³ atoms of Cl = 1 mole of Cl

• 1 mole of Cl = 35.5 g

$\rule{10cm}{0.05cm}$

10.8 < 35.5 < 50 < 80

the lowest is 0.1 mole of Ag