A large weather balloon filled with helium has a volume of 7.00 x 102 L at STP. Which expression should be used to find the mass of helium in the balloon?

Is weight the amount of matter or mass that there is in a given amount of space or volume

Suppose you had 10 mol of NaCl and you dissolved it in exactly 3.00 kg of pure water (the solvent). What would be the molality of the solution in mol/kg?

What are some examples of kitchen chemistry

What do we call the set of compounds that are on the left of the reaction arrow

Statement best describing why carbon is such an important element

What is a neutral atoms oxidation number

Suppose 30 grams of NaCl are placed in 900 mL of water. What is the molarity of this solution?

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.