A sample of gas was enriched to contain 2 % by mass of N with the remainder being N. Calculate the relative molecular mass of the resulting N O.

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?