Ah, the obvious answer about molecular weight isn't wrong, but for HF, it's not the main story, shisha! The key is the strong hydrogen bonding—those H-F bonds are stubborn and need more heat to break than the simple dipole-dipole forces in HCl. My lab work with fluorine compounds shows this every time; that little fluorine atom creates bonds that punch far above their weight! So it's not about being heavier, but about being much, much stickier. Sngewbha when the data makes it clear!
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