Use the periodic table from the lesson to answer the following question. the atomic mass of f is ___.

Calculate the change in energy requiredto convert 250. g of substance X from a gas at 121°C to a solid at - 49.0°C. Assume X has molar mass = 75.0 g/mol. Also, substance X has the following properties:

At what part of most rivers dose the water flow quickly

Most lakes have rivers flowing out of them, carrying water to the ocean. However, some lakes, including Great Salt Lake and the Dead Sea, have no outlet. Water flowing into these lakes leaves only through evaporation.

Which gas effuses faster at the same temperature: molecular oxygen or atomic argon?

How would the permeability of materials change as sand undergoes lithification to form sandstone?

How many moles of barium hydroxide, Ba (OH2), would be required to react with 117 g hydrogen bromide, HBr?

Which carbon compound is soft, slippery, a decent electricity conductor, and bonded in a way that forms planes? coal petroleum graphite

Which of the following describes chemical properties

What's nuclear decay

When is a hurricane nears land, causes the most damage?