in an experiment 3.5g of element A reacted with 4.0g of element G to form a compound Calculate the empirical formula for this compound

Additional information

Relative atomic mass(Ar) : A=7, G=16

The empirical formula : A₂G

Further explanation

Given

3.5g of element A

4.0g of element G

Required

the empirical formula for this compound

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.

The empirical formula also shows the simplest mole ratio of the constituent elements of the compound

mol of element A :

mol of element G :

mol ratio A : G = 0.5 : 0.25 = 2 : 1

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

The mass has escaped into a gas which you can not see so the law stays true.