A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.

Enter your answer in the provided box. On a certain winter day in Utah, the average atmospheric pressure is 718 torr. What is the molar density (in mol/L) of the air if the temperature is - 29°C?

A chemistry student adds a quantity of an unknown solid compound X to 5.00 L of distilled water at 15.° C. After 10 minutes of stirring, only a little X has dissolved. The student then drains off the solution and evaporates the water under vacuum.

Do the benefits of medical marijuana justify its legality?

A 43.6 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.5 grams. What was the percent iron in the sample of ore? Answer in units of %.

Javier forgot to polish the magnesium metal. Will the reported mole ratio of magnesium to oxygen be too high or too low as a result of his mistake? Explain.

Does water have a warmer heat capacity than land?

How many bonds do iodine and hydrogen have?

A voltaic cell differs from an electrolytic cell in that a chemical cell uses 1) Half-life reactions 2) A solution of ions 3) An applied electric current 4) Redox reaction to produce electricity

Given the reaction: 4NH3 + 3O2 2N2 + 6H2O. How many moles of N2 are produced when 1.0 mol of NH3 is consumed

What is the oxidation number of nitrogen (N) in the compound HNO3? A) + 1 B) + 5 C) + 6 D) + 7