First slide

Numericals involving moles and volume of gas at STP

Question

Which of the following sample weighs more ?

Easy

A

2 gram atoms of silver
B

224 litres of ethane at STP
C

10 moles of nitrogen
D

248 grams of phosphorous

Solution

(1) 2 gram atoms of silver = 2 $\times$ 108g = 216 g ;
(2) 224 litres of ethane at STP= 224 $\times$ $\frac{30}{22.4} g$ = 300 g ;
(3) 10 moles of nitrogen = 10 $\times$ 28 g = 280 g ;
(4) 248 grams of phosphorous ;

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