Determine the molar mass of CH3CH2OH. Provide an answer to two decimal places.

Classify each as exothermic or endothermic AND explain why.   N2O4(g) + 19 kcal →  2 NO2(g)      H2O(g) + CO(g) →  H2(g) + CO2(g) + 10 kcal

Part A: How many atoms of hydrogen does it contain?         Express your answer using four significant figures.   Part B: How many molecules of glucose does it contain?         Express your answer using four significant figures.   Part C: How many moles of glucose does it contain?         Express your answer using four significant figures.   Part D: What is the mass of this sample in grams?         Express your answer using four significant figures.

Aspirin, also known as acetylsalicylic acid (C9H8O4), is a drug often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. How many grams of oxygen are in a 17.8 g sample of acetylsalicylic acid? Report your answer to 2 decimal places and do NOT include units in your answer.

You have a stock solution of HCI that is 37.4 % HCl by mass and has a density of 1.20 g/mL. What volume (in mL) of the concentrated HCI solution is needed to prepare 1.518 L of 0.693 M HCI? The molar mass of HCl is 36.458 g/mol. Report your answer to 1 decimal place.

A chemist prepares a solution of nickel(II) chloride  NiCl2  by weighing out  22.06g  of nickel(II) chloride into a  100.mL  volumetric flask and filling the flask to the mark with water. Calculate the concentration in  /gdL  of the chemist's nickel(II) chloride solution. Round your answer to  3  significant digits.

Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. Suppose 79.3 g of hydrobromic acid is mixed with 24. g of sodium hydroxide. Calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.

A 195 mL sample of ocean water contains 7.0 gg of NaCl. What is the molarity of the solution with respect to  NaCl ?        Express your answer using two significant figures.

67. Pure bromobenzene, C H Br, boils at 156.0°C and has a boiling point constant of 6.26°C/m. A sample of bromo benzene is contaminated by anthracene, C4H10. The boiling point of the impure sample is 159.2°C. How pure is the sample? (Express your answer as mass percent bromobenzene.) I've spent forever trying to figure this out. For now my answer is 6.56%, but it doesn't seem right. Before, I got 97.9%. are either of those correct?

The chemistry teacher needs a solution made up of a 3 g sugar cube (C6H1206) dissolved in a 250 ml teacup. Find the molarity of this solution. Be sure to report your answer to the correct number of significant figures. Do not include units.