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.
With each new week during the second trimester, a new stage of pregnancy is experienced by the mother and developing fetus. During the second trimester, an expectant mother can expect a rapid increase in the size of the uterus. At the end of the trimester, a developing fetus will be approximately four times larger than it was at the end of the first trimester.