A 3.00-L flask is filled with propane (C3 H6) at 1.00 atm and -20.0 oC. What is the mass of the propane in the flask?

Read the given expression. x = number of protons − number of core electrons which of the following explains the identity of x and its trends across a period? x is the effective nuclear charge, and it remains constant across a period. x is the screening constant, and it remains constant across a period. x is the effective nuclear charge, and it increases across a period. x is the screening constant, and it increases across a period.

What is the maximum amount of al2(so4)3 which could be formed from 15.84 g of al and 12.89 g of cuso4?

How many atomic mass units are equal to 1.672×10−24 g of protons?