Explanation
The relation to find number of spectral lines is (n2−n1)(n2−n1+1)2
Here transition is from n = 4 to n = 1
So, number of spectral lines = 3×42=6
Hence, there are 6 spectral lines.
Molar mass of Ca=M‘=40
Molar mass ofMg=M=24
Given mass of Ca=m‘=40g
Given mass of Mg=m=?
Formula: m=m‘×M/M‘
m=40×2440
m=24g
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