Law of Constant Composition Guided Notes - Student Edition
The Law of Constant Composition (Proust's Law)
All pure substances have a
_composition and will contain the same elements
combined together in the same
The composition of a pure substance remains the
same regardless of the
of the substance, how it's
or its
method of

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

there are two significant figures.