What has 20 electrons in 44 Mass

The mass of one electron is 9.11 x 10^-28 what is the mass of 1.00 mole of electrons

An atom of phosphorus has an atomic number of 15 and a mass number of 31. how many protons and neutrons does it contain?

Determine the mass in grams of 1.35 mol Fe

Explain why the production of a gas doesn't always mean a chemical reaction has occurred

t takes 7.21 ⋅ 10 - 19 J of energy to remove an electron from an iron atom. What is the maximum wavelength of light that can do this?

How does water vapor get into the atmosphere?

Which statement a-d about a state function is not correct? A - the value of a stage function can change along a path. B-the final value of a state function is independent of the path taken to reach the final state.

100mL of water initially at 35°C is placed inside a calorimeter. What will be the final temperature in the calorimeter if 50g of aluminum initially at 100°C is added to the water?

Which is an example of a chemical change? ripping paper chopping wood baking a cake stretching a rubber band

Scientists have measured and recorded the average rainfall of an area over several years to see if there is a pattern. Which kind of investigation does this best describe? A. controlled experiment B. systematic observation C. field study D.