The mole in a sample of sulfur weighing 407 g how

This preview shows page 4 - 6 out of 45 pages.

4 The Mole In a sample of sulfur weighing 4.07 g, how many moles of sulfur are present and what is the total number of sulfur atoms in the sample? The Mole Determine the name of the mystery element if a 2.80 x 10^22 atom sample of the element has a mass of 4.24g. The Mole How many K atoms are present in 225mL of milk containing 1.65mg K/mL? The Mole How many K (potassium) atoms are present in 1.2 L of milk containing 2 mg K/mL? (molar mass of K = 39.10 g/mol)
The Mole How many molecules are in a 1µg sample of isopentyl acetate (C7H14O2)? How many atoms of carbon are present in this sample? The Mole A certain compound called B has x number of magnesium atoms per molecule of B. The oxidation of 200 g of B produced 500 mg of MgO. How many magnesium atoms are present in one molecule of B? Assume that the initial amount of magnesium present in B reacted to produce MgO and the molar mass of B is 32260 g/mol. (molar mass of MgO = 40.3044 g/mol)
The Mole The haemoglobin content of blood is about 15.5g/100mL blood. The molar mass of the haemoglobin is 64500g/mol. There are about 4 iron atoms in a haemoglobin molecule. How many atoms of Fe are in 6.0L of blood? The Mole Indicate which of the following quantities contains the greatest number of atoms: 6.022 x 10 23 Ni atoms 25.0 g nitrogen 52.0 g Cr 10.0 cm 3 Fe (density = 7.86 g/cm 3 )
The Mole An alloy that melts at about the boiling point of water has Bi, Pb, and Sn atoms in the ratio of 10:6:5, respectively. What mass of alloy contains a total of one mole of atoms?
Chemical Formulas What is the mass composition (in %) of halothane, C 2 HBrClF 3 (Molar mass: C = 12 g/mol, H = 1.01 g/mol, Br = 79.90 g/mol, Cl = 35.45 g/mol, F = 19 g/mol) ?
5 Chemical Formulas Find the molecular formula of a compound containing 12% Carbon, 41% Nitrogen, 47% Oxygen. Assume the molar mass of this compound is 204 g/mol.
Chemical Formulas A certain compound, used as a welding fuel, contains only carbon and hydrogen. Burning a small sample of the compound completely in oxygen only, gives 3.38 g of carbon dioxide, 0.692 g of water, and no other products. What is the empirical formula of the welding fuel?
Chemical Formulas An excess of aluminum foil is allowed to react with 225mL of an aqueous solution of HCl that has a density of 1.088g/mL and contains 18% HCl by mass. What mass of H2 is produced?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture