The name isovolumetric indicates that there is no change in volume that takes place and this only occurs when all of the valves within the heart are shut.
n = m/M = 2/18 = 1/9 ~0,1 mol
A physical change is any change in a substances form that does not change its chemical makeup. Examples of physical changes are breaking a stick or melting ice. A chemical change occurs when atoms of a substance are rearranged, and the bonds between the atoms are broken or formed. HOPE THIS HELPS!!
A fact can be disapproved with further evidence different details. So basically evidence can change a fact!! Hope this helps
