How many mol of hydrogen are needed to double the volume occupied by 0.34 mol of hydrogen,

assuming no changes in pressure or temperature? Enter your answer in the provided box.

Write a conversion factor that could be used to convert between moles of chlorine and moles of potassium chloride.

A student has 70.5 mL of a 0.463 M aqueous solution of sodium bromide. The density of the solution is 1.22 g/mL. Find the following: a.) mass of the solution b.) grams of sodium bromide c.) molality of the solution d.) % (m/v) of the solution e.

A gas has a volume of 1.2l at STP. What will it's volume be if the temperature stays constant and pressure is increased to 2 atm

A student analyzed an unknown sample that contained a single anion. The sample gave a yellow precipitated upon addition of a solution of AgNo3 which did not dissolve in ammonia.

A long crack in earths crust from which lava may flow is called a

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.

Compared to a phosphorus atom, a P3 - ion has (1) more electrons and a larger radius (2) more electrons and a smaller radius (3) fewer electrons and a larger radius (4) fewer electrons and a smaller radius

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.