Chemistry Answers

What are the empirical and molecular formulas of a compound that is 40.27 % potassium, 26.78 % chromium, and 32.95 % oxygen? The molar mass of the compound is 194.2 g/mol.

Find the volume of 0.8 moles of a gas that has a pressure of 100 kPa at 27°C.

Calculate the molar mass of acetaminophen (C_{8}*H_{9} * N * O_{2}) an over-the-counter pain reliever also known as paracetamol.

Lithium has two known stable isotopes- lithium-6 and lithium-7. Lithium-6 has an isotopic mass of 6.015 amu and percent abundance of 7.59%; lithium-7 has a mass of 7.016 amu at 92.41 % abundance. Calculate the average atomic mass of lithium.

How many grams of C5H8 are needed to produce 216 g of H20

Choose 5 of listed forms of enthalpy of reaction given above and give 1 example of chemical reaction each form with it's brief explanation why it is categorized to that form enthalpy.

an orange juice drink sold in the supermarket is 10% by volume of pure orange juice. what volume (in mL) of pure orange juice is present in a 100 mL juice drink? what volume (in mL) of water is present in his juice drink?

Bismuth-213 is used in radiation therapy to treat leukemia, while strontium-89 is utilized to treat bone metastasis. Write the isotopic symbols of the two atoms. How many protons and neutrons does each atom have?

Correct IUPAC name of 2,4-Butanediol

. A sample of an unknown material was analyzed and was found to contain 28.1 g of silicon and 32.0 g of oxygen. What conclusion can best be made about this sample? (A) The sample must be SiO2, because the mole ratio is 1:2. (B) The sample must be Si7O8, because the ratio by mass reduces to 7:8. (C) The sample must be a mixture, because the masses of the elements are different. (D) The sample must be SiO, because the masses of the compounds are close to the same.