This will solve for any of the 4 items in Boyles Law
P₁ x V₁ = P₂ x V₂

This will solve for any of the 4 items in Charles Law assuming constant pressure
V1 ÷ T1 = V2 ÷ T2

This will solve for any of the 6 items in the Combined Gas Law using pressure, volume (Capacity), and temperature.
(P₁ x V₁)/T1 = (P₂ x V₂)/T2

Solves for any of the 3 items in the Density Formula, Density (D), Mass (M), and Volume (V) (Capacity), with 2 given items.

Calculates the molar mass of an element or solution.

Shows details of all the elements on the periodic table including atomic weight, natural state.

This will solve for any of the 4 items in the Pressure Law equation, also known as Gay-Lussacs Law assuming constant volume
P1 ÷ T1 = P2 ÷ T2

Converts between molecules, moles, grams