Vitamin K antagonists (VKA) are a group of substances that reduce blood clotting by reducing the action of vitamin K. They are used as anticoagulant medications in the prevention of thrombosis, and in pest control, as rodenticides. 1  1 Mechanism of action.  2 Coumarins (4-hydroxycoumarins)
Calculate the average atomic mass of oxygen. Solution: ((15.994915*99.757) + (16.999132*0.038) + (17.999160*0.205))/100 = 15.999405 . Using our equation for determining average atomic mass, we see that the average atomic mass for oxygen is 15.999405 amu. If we check the periodic table, we will see that our average atomic mass is the same as the atomic mass indicated on the element oxygen. Ã
There are many different ways to calculate the moles and grams of oxygen. but one mole of oxygen is always gonna equal 32 grams because its diatomic, meaning it only comes in â¦ nature as O2. so it would be the atomic mass of oxygentimes 2. 16*2= 32.+ 12 others found this useful.herefore, the gram molecular mass of oxygen gas is twice the atomic mass of oxygen, or about 32 gram â¦ s. Therefore, 32 g of oxygen gas constitutes 1.0 moles of oxygen, to the justified number of significant digits. 1 person found this useful. Noah Mitchelson.