How many balloons, each containing 6.02*10^23 particles of helium gas, can be filled from a tank that contains 1.204 * 10^25 helium particles?

Calculate the mass (in g) of 2.1 x 1024 atoms of W.

Do all colors of light have the same energy?

Which of the following is the correct scientific notation for 0.0000782 g? 7.82*105 g 7.82*106 g 7.82*10-6 g 7.82*10-5 g

Why do you cool down tea extract in ice to below 40°c before adding dichloromethane?

What is the modern atomic model sometimes called?

Which statements describe abiotic factors in an environment?

A ball rolling across the ground in Death Valley will slow and eventually stop. Why? - the ball's kinetic energy evaporates. - the ball's force is destroyed. - the friction of the ball changed the force to negative ions.

Calculate ∆h0 for the following reaction. br2 ( g. → br2 (l) ∆hf0 br2 ( g. = 30.91 kj/mol; ∆hf0 br2 (l) = 0 kj/mol)

Ethyl alcohol has a latent heat of vaporization of 850 J/g. Water has a latent heat of vaporization of 2260 J/g. Container A contains 1.0 kg of ethyl alcohol. Container B contains 1.0 kg of water. Both liquids are brought to a boil.

The greatest composition by mass in an atom 17/8 O is due to the total mass of its