Study the model. The model shows a sodium chloride compound. What kind of substance is shown here?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h