You just need to multiply the total mass by the decimal value of the part that is tin. 133.8*0.103=13.8g (following the rules of significant figures).
Bro honestly I don’t understand either
Here’s the math for your answer, which is 3.3 L HCl
b,f,h are already balanced
N = 4 to n = 3 is the right answer, so it' none of the above