How many moles of potassium nitrate, KNO3 , contains 8.68 x 1020 KNO3 formula units?

The correct chemical formula for the binary ionic compound between Mg2+ and O2- is:

A glass cylinder contains four liquid layers: mercury (d = 13.6 g/mL), chloroform (d = 1.49 g/mL), water (d = 1.00 g/mL) and ether (d = 0.708 g/mL). If a solid ball (d = 1.45 g/mL) is dropped into the cylinder, where does it come to rest?

The decomposition of methane, CH4, the main component of natural gas can be used to generate hydrogen fuel. The decomposition gives carbon (C) and hydrogen (H) in a ratio of 3.00 parts by mass of carbon to 1.00 part by mass of hydrogen. How much hydrogen can be made from 62.0 g methane?

The name of the compound N2O5 is:

What is the mass of 0.500 mol of NH3?

8.16 As described in the book, a concentration of any substance in the air that can cause death, incapacitation, impaired abilities, injury or illness is called a/an

8.23 Chem. 9.1, 3 & CLA 1 & 2 Mark all that apply about respirators.

8.16 As described in the book, a concentration of any substance in the air that can cause death, incapacitation, impaired abilities, injury or illness is called a/an

5.1 CLA1 Which type of equipment hazard is a result of repetitive motions during maintenance?