Answer:
Number of moles of oxygen atoms having equal mass as glass of water = 3.12 moles
Note: The given question is missing some figures. Here is a complete similar question below.
An oxygen atom has a mass of 2.66*10^-23 g and a glass of water has a mass of 0.050 kg. What is the mass of 1 mole of oxygen atoms? Round your answer to 3 significant digits. How many moles of oxygen atoms have a mass equal to the mass of a glass of water? Round your answer to 2 significant digits.
Explanation:
A mole of a substance contains the Avogadro number of particles = 6.02 * 10²³
Therefore a mole of oxygen atoms contains 6.02*10²³ atoms.
mass of 1 atom of oxygen = 2.66*10⁻²³ g
Mass of 1 mole of oxygen atoms = mass of 1 atom * number of atoms in 1 mole
Mass of 1 mole of oxygen atoms = 2.66*10⁻²³ g * 6.02*10²³ = 16. 01 g
Mass of a glass of water = 0.050 Kg or 50 g
To determine the number of moles of oxygen atoms that have a mass equal to a glass of water i.e. 50 g, the formula below is used;
number of moles = mass/molar mass
mass of oxygen atoms= 50 g, molar mass or mass of one mole of oxygen atoms = 16.01 g
Therefore, number of moles of oxygen atoms = 50 g / 16.01 g = 3.12 moles
