Q. 253.9( 62 Votes )
How are 0.50 mol Na2CO3 and 0.50 M Na2CO3 different?
Atomic Mass of Oxygen = 16g
Atomic Mass of Carbon = 12g
Atomic Mass of Sodium = 23g
Molecular Mass of Sodium Carbonate = [23×2] + [12×1]+[16×3]
= 46 + 12 + 48
1 mole of Na2CO3 = 106 g
0.5 mole of Na2CO3 = X g
X = [0.5×106]/1
= 53g of Na2CO3
0.5M of Na2CO3 signifies 0.5 moles of Na2CO3 dissolved in 1 litre of water or rather 53g of Na2CO3 dissolved in 1 litre of water.
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In a reaction
Identify the limiting reagent, if any, in the following reaction mixtures.
(i) 300 atoms of A + 200 molecules of B
(ii) 2 mol A + 3 mol B
(iii) 100 atoms of A + 100 molecules of B
(iv) 5 mol A + 2.5 mol B
(v) 2.5 mol A + 5 mol BNCERT - Chemistry Part-I