(d)Using the formula Mn(ClO₄)₄ (MM = 452.74), what is the percent by mass of Cl in the compound? (e)how many moles of manganese perchlorate are in 101.3g? (f)How many moles of oxygen are in 101.3 g of manganese perchlorate

1.Glucose is an important biological molecule with the molecular formula C₆H₁₂O₆. What is its empirical formula? 2.What is the mass percentage of C in C₂H₆O₂? 3. You measured the mass of a dry powder on a balance to be 23.76g. What would you report as the uncertainty of this measurement?

For 1.28 moles of aspirin, C6H8O4, how many molecules of aspirin are present? (Avogadro's number = 6.02 x 1023)

74. A throat lozenge contains 5.0 mg of menthol, which has the formula C10H20O. How many moles of menthol are in 5.0 mg of menthol? What is the mass in grams of 1.56 moles of menthol? 79. For each of the following ionic substances (a) Co2O3 and (b) Fe2(C2O4)3, calculate its formula mass and write a conversion factor that converts between mass in grams and moles of the substance.

Prevacid is used to treat gastroesophageal reflux disease (GERD). The chemical formula of Prevacid is C16H14F3N3O2S. a). What number of hydrogen atoms is in 0.23 mol of Prevacid? b). What is the mass of  8.43 x 10^21 molecules of Prevacid?

(a) What is the mass, in grams, of 4.62  1023 molecules of aspirin, C9H8O4?  (b) What is the molar mass of diazepam (Valium(R)) if 0.05570 mol weighs 15.86 g?  g/mol (c) How many moles of ammonium ions are in 0.645 g of ammonium carbonate?

(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a nickel atom is 125 pm. What is this value in meters and in centimeters? cm -23 (b) The mass of a single nickel atom is 9.75×10 g. Suppose enough Ni atoms were lined up like beads on a string to span a distance of 31.3 cm (12 inches). How many atoms would be required? atoms What mass in grams of Ni would be used? Could you weigh out this amount of nickel using a typical laboratory balance? (c) Taking the density of nickel metal to be 8.91 g/cm, calculate the mass of metal needed to form a piece of Ni wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is n times its radius squared times its height. (V = nr h) How many nickel atoms does this represent? atoms

I only need parts B and D, thank you!   The following quantities are placed in a container: 1.98 × 10^24 atoms of hydrogen, 1.32 mol of sulfur, and 113.8 g of diatomic oxygen. (b) What is the total number of moles of atoms for the three elements? (c) If the mixture of the three elements formed a compound with molecules that contain two hydrogen atoms, onesulfur atom, and four oxygen atoms, which substance is consumed first? (d) How many atoms of each remaining element would remain unreacted in the change described in (c)?

How many chloride atoms are in 32.3 g of CaCl2?  write the answer in this format 1.00x10^1 unit Cl  What is the mass percent carbon in benzoic acid, C6H5COOH?

Be sure to answer all parts. Potassium is the second most abundant metal in the human body. Calculate the following: (a) The number of atoms in 7.11 moles of potassium. X 10 atoms Enter your answer in scientific notation. (b) The number of moles of potassium that contains 9.11 × 1025 atoms. x 10 mol Enter your answer in scientific notation.