What is the mass of a sample of NH3 containing 7.20 x 10^24 molecules of NH3?

161 grams

187 grams

203 grams

214 grams

Dead leaves decaying, is it a chemical or physical change

The electrons of an atom are negatively charged and located inside the nucleus. positively charged and located inside the nucleus. negatively charged and located outside the nucleus. positively charged and located outside the nucleus.

Two substances, x and y, are to be identified. substance x cannot be broken down by a chemical change. substance y can be broken down by a chemical change. what can be concluded about these substances?

A 22 gram ball is rolling at 5m/s. the ball has Energy

What is the relationship between the length of daylight and the sun's angle

In an acid-base titration, of 20 ml of a m HCI solution with 1 m NaOH. How many ml of NaOH are needed

Which of the following is not a source of air pollution related to human activities

Objects and substances in motion is I

If you were to remove an electron from a sodium atom that has eleven protons, what would be the electrical charge of the ion?

The atomic mass of fluorine in 19.0 amu, so the molar mass is?