Question 27 (2 points) How many grams of Cu are in 1.480 x 1025 cu atoms?
a
1,500g
b
1,562.36g
c
1,5625
d
1,5605
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1562 g

Explanation:

Step 1: Given data

Number of atoms of copper: 1.480 × 10²⁵ atoms

Step 2: Calculate the moles corresponding to 1.480 × 10²⁵ atoms of copper

We will use the Avogadro's number: there are 6.022 × 10²³ atoms of Cu in 1 mole of atoms of Cu.

1.480 × 10²⁵ atom × (1 mol/6.022 × 10²³ atom) = 24.58 mol

Step 3: Calculate the mass corresponding to 24.58 moles of copper

The molar mass of Cu is 63.55 g/mol.

24.58 mol × 63.55 g/mol = 1562 g (with 4 significant figures)

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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