First slide

Numericals involving moles, molecules and atoms

Question

‘X’ grams contain six gram atoms of calcium. ‘X’ grams contain ‘Y’ gram atoms of magnesium. The value of 'Y' is

Moderate

A

10
B

5
C

15
D

20

Solution

‘1’ gram atom of ‘Ca’ = 40 g ;
‘6’ gram atoms of ‘Ca’ = 240 g ;
‘X’ = 240 g ;
‘1’ gram atom of ‘Mg’ = 24 g ;
‘Y’ gram atoms of ‘Mg’ = 240 g (X);
Y = 10 ;

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