Question

14: Calculate the number of gram-atoms in a sample of
lead (at. wt. 207) weighing 100 grams
(1) 0.0483
(2) 0.24
(3) 4.8
(4) 0.48​

Answer 1

answer : option (4) 0.48

explanation : given , weight of sample of lead = 100gm

we know, atomic weight of lead = 207 g/mol.

we have to find gram-atoms of sample of lead. gram-atoms of lead means mole of lead. actually indirectly question asked us to find mole of sample of lead.

so, mole of lead = given weight in gm/atomic weight

= 100/207 mol

= 0.48 mol

hence , gram-atoms of sample of lead is 0.48

Answer 2

gram- atom means ..... Number of moles of lead