Repeating decimals. 1  Converting a fraction to a repeating decimal. 2  Practice: Writing fractions as repeating decimals. 3  Converting repeating decimals to fractions (part 1 of 4  2) Practice: Converting repeating decimals to fractions 5  1. Converting repeating decimals to fractions (part 2 of  2)
hydatid mole , hydatidiform mole an abnormal pregnancy characterized by placental abnormality involving swollen chorionic villi, which form a large, grapelike mass of vesicles, by trophoblastic hyperplasia, and by loss of fetal blood vessels in the villi.
A mole is a quantity (in grams) that equals the molecular number of the substance. Oxygen has atomic number 16, hydrogen 1, so H2O = 2*1+16=18. So indeed a mole of water is 18grams. The mole (animal) is something like a rat. The qustions (1, 2, 3) you have are rather like quizes, they don't really have answers.