Question

why SbH3 has more boiling point than ​

Answer 1

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Why is the boiling point of SbH3 (-17°C) higher than NH3 (-33°C)?

A general rule is that similar compoumds in the same Group, like the hydrides of nitrogen and antimony, have boiling points that increase as you go down the table. The higher the molecular mass, the higher the boiling point.