This diagram shows that there are high tides on the side of Earth closest to the moon and on the side opposite the moon, and low tides in the areas in-between. The moon’s gravity is one cause of the high tides. What causes the low tides?

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

you didnt put any of the following

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)