A chemistry student needs 20.0 g of acetone for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of acetone is 0.790 g·cm '. Calculate the volume of acetone the student should pour out. Be sure your answer has the correct number of significant digits. I mL ?

please make sure the answer has the correct number of significant digits

A jet airplane reaches 682. km/h on a certain flight. How long does it take to cover 342. m? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. time x10 μ □·□ 믐

Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 19. g of hexane is mixed with 38.1 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

To reduce dangerous swelling in the brain, physicians sometimes administer intravenous hypertonic saline, a 5.0% (w/v) solution of salt NaCl in water. Calculate the mass of NaCl in 175. mL of this solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.

Aqueous hydrochloric acid (HCI) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium chloride (NaCl) and liquid water (H,0). Suppose 2.9 g of hydrochloric acid is mixed with 5.44 g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. ?

A chemistry student needs 45.0 g of diethylamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of diethylamine in 0.706 g*cm^-3. Calculate the volume of diethylamine the student should pour out. Be sure your answer has the correct number of significant digits.

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 1.50 g of ethane is mixed with 10. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.

A recent study found that the median concentration of lead in Canadian tap water is 2.3 x10-8 mol/L. Calculate the mass, in grams, of lead consumed when an individual drinks 3.0 L of water. You must show your work.  Then, record your final answer in scientific notation, with the correct number of significant digits and proper units.

A chemistry student needs 75.0 g of methyl acetate for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that -3 the density of methyl acetate is 0.934 g⋅cm¯³. Calculate the volume of methyl acetate the student should pour out. Round your answer to 3 significant digits. mL x10 X Ś