Question

A triatomic molecule can be modelled as three rigid sphere joined by three rigid rods forming an triangle. Consider a triatomic gas consisting such molecule. If gas performs 30 J work when it expands under constant pressure the heat given to gas is ______.

Options

• 60 J

• 30 J

• 45 J

• 120 J

Answer 1

A triatomic molecule can be modelled as three rigid sphere joined by three rigid rods forming an triangle. Consider a triatomic gas consisting such molecule. If gas performs 30 J work when it expands under constant pressure the heat given to gas is 120 J.

Explanation:

`(Delta"Q")/"W" = "C"_"p"/"R"`

C_p = `("f"/2+1)`R  (f = degree of produce)

= 4R

∴ ΔQ = 4W = 120 J