13. If Avogadro number NA, is changed from 6.022 × 1023 mol –1 to 6.022 × 1020 mol–1, this would change (2015)
(a) The mass of one mole of carbon
(b) The ratio of chemical species to each other in a balanced equation
(c) The ratio of elements to each other in a compound
(d) The definition of mass in units of grams