How many moles of K2HPO4 are in 41.2 g of K2HPO4?

What is the physical phase at T = 300 K and P = 20 atm of the substance whose phase diagram is given below? img5fbbcc9d5.gif

Air is a mixture of many substances, including nitrogen, oxygen, carbon dioxide, argon, and water. Which of the following properties of substances are “differentiating characteristics” that could be used to separate or identify each component?(select all that apply)

What is the ground-state electron configuration of the arsenic (As) atom?

Soda ash (Na2CO3) can be extracted from the ashes of plants growing in sodium-rich soils. Which of the following images best represents the submicroscopic structure of this chemical compound in water? (water molecules are not represented) U4_F19 MPW – 2.jpg

The image shows the heating curve for nitrogen. Use the data to estimate the boiling point of this substance. Heating Curve Nitrogen.png 

When heat moves from the system to the surroundings, this process is called?

Which one of the following molecules has a dipole moment?

Which compound is correctly paired with its molar mass?

Which of the following elements is best classified as a non-metal?