In order to grasp the concept of molar mass calculations it is important to understand the molar unit. The mole also called mol is the basic unit of measurement in chemistry. By definition, in modern chemistry, one mole represents the number of carbon atoms in exactly 12 grams of carbon 12 isotope.
Fetal development during the first trimester. The most dramatic changes and development for your baby occur during the first trimester. Itâs also during this time that the fetus is the most susceptible to damage from alcohol, drugs, certain medications, and illnesses.
The first trimester is a tremendous time of development and change for you and your little one. With all that change comes some risk that the pregnancy might not carry to term. Between 10 and 25 percent of known pregnancies end in miscarriage, and roughly 80 percent of these miscarriages occur in the first trimester.