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

Which of the following statements is true? Divergent faults happen when two plates move toward each other. Tsunamis are caused by the erosion of beaches. Earthquakes can be caused by volcanic eruptions.

Determine the molecular formulae of the following compounds; a) Magnesium oxide b) Lithium carbonate c) Copper (11) nitrate

In which of the following calculations is there more than one significant figure in the answer? 123 times 89 8.85 plus 1.11 15.2 divided by 30.3 8 minus 2.55

Which is the least effective strategy for communicating about environmental issues? A. attacking the opposition's personality rather than its facts B. welcoming responses from the other side C. presenting both sides of an argument D.

Al (s) + FeCl (aq) → AlCl3 (aq) + Fe (s)

Which statement is true about the speed of light waves in a medium? a. Depends on the temperature of the light wave b. Decreases with a decrease in density of medium c. Decreases with an increase in density of medium d.

What's a certain indicator that a molecule is polar? the molecule has a nonpolar covalent bond and the dipole is cancelled due to symmetrical arrangement of atoms the molecule has a polar covalent bond and the dipole is cancelled due to symmetrical

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.

Give the state of matter that water is in as it moves through earths system

What happens to the volume of a substance as temperatures rises?