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Calculating Molar Mass quiz #8

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  • How many grams are in 4.5 moles of sodium fluoride (NaF)?
    Mass = 4.5 × 41.99 g = 188.96 g.
  • Determine the formula weight of KBr. Provide an answer to two decimal places.
    Formula weight of KBr = 119.00 amu.
  • Determine the molar mass of CH3OCH3. Provide an answer to two decimal places.
    Molar mass of CH3OCH3 = 46.07 g/mol.
  • Determine the molar mass of C2H5N. Provide an answer to two decimal places.
    Molar mass of C2H5N = 43.07 g/mol.
  • In 85.2 g of FeCl2 there are how many moles of FeCl2?
    Moles = 85.2 g / 126.75 g/mol = 0.672 mol.
  • What is the molar mass of Ca(OH)2?
    The molar mass of Ca(OH)2 is 74.10 g/mol.
  • Determine the formula weight of Ca(NO3)2. Provide an answer to two decimal places.
    Formula weight of Ca(NO3)2 = 164.10 amu.
  • What is the molar mass of Al?
    The molar mass of Al is 26.98 g/mol.
  • How do you interconvert number of atoms and mass of a compound?
    Convert mass to moles using molar mass, then moles to atoms using Avogadro's number.
  • What is the molar mass of gold (Au)?
    The molar mass of gold is 196.97 g/mol.
  • What mass in grams are in 5.32 × 10^22 molecules of CO2?
    Moles = 5.32 × 10^22 / 6.022 × 10^23 = 0.0884 mol; mass = 0.0884 × 44.01 g = 3.89 g.
  • Determine the quantity of nitrogen atoms in 15.0 grams of Pb(NO2)2.
    Moles = 15.0 g / 269.22 g/mol = 0.0557 mol; N atoms = 0.0557 × 2 × 6.022 × 10^23 = 6.71 × 10^22.
  • What is the molar mass of C6H12O6?
    The molar mass of C6H12O6 is 180.16 g/mol.
  • Refer to the periodic table to find the correct molar mass for each given element or compound.
    Use the periodic table to find atomic masses and sum them for compounds.
  • What is the definition of molar mass in chemistry?
    Molar mass is the mass of a substance divided by the amount of that substance, typically expressed in grams per mole (g/mol).
  • How do you calculate the molar mass of a compound such as NaCl?
    To calculate the molar mass of NaCl, add the atomic masses of sodium (Na) and chlorine (Cl) to obtain the total mass in grams per mole.
  • What is the general method for determining the molar mass of a compound like aspartic acid (C4O4H7N)?
    To determine the molar mass of aspartic acid (C4O4H7N), sum the atomic masses of all atoms in the formula: 4 carbons, 4 oxygens, 7 hydrogens, and 1 nitrogen.
  • How would you find the molar mass of citric acid if given its chemical formula?
    To find the molar mass of citric acid, add together the atomic masses of all atoms present in its chemical formula to get the total mass in grams per mole.
  • What is the mass of one mole of sulfur atoms?
    The mass of one mole of sulfur atoms is equal to the atomic mass of sulfur expressed in grams per mole.