The average atomic mass of a sample of an element X is 16.2u. What are the percentages of isotopes X (mass number 16, atomic number 8) and X (mass number 16, atomic number 8) in the sample?

H2O (g) + Cl2O (g) ↔ 2 HOCl (g) (a) Initially, 0.0555 mol H2O and 0.0230 mol Cl2O are mixed in a 1.00 L flask. At equilibrium, there is found to be 0.0200 mol of HOCl (g). Calculate the concentrations of H2O (g) and Cl2O (g) at equilibrium.

A gas with a volume of 1.4 L at 25ºC is heated to 50ºC. What is the new volume? a. 2.8 L b. 1.5 L c. 1.3 L d. 0.7 L

Which of the compounds listed below is more acidic than 1-butanol?

Why is the second ionization energy greater than the first ionization energy? a. it is more difficult to remove a second electron from an atom b. the size of atoms increases down a group c. the size of anions decreases across a period d.

Design a synthesis of 2-ethoxy-2-methylpropane from 2-methylpropene.

Why is it necessary for the measuring devices to be clean

Copper consists of two naturally occuring isotopes. their masses are 62.930 amu and 64.928 amu. calculate their abundances.

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.