Part 1 For 671 g of butadiene (C4H6) calculate the number of moles.
Answer in units of mol.
Part 2
Calculate the number of molecules.
Answer in units of molec.

74.73 ×10²³ molecules

Number of moles = 12.41 mol

Explanation:

Given data:

Mass of C₄H₆ = 671 g

Number of moles = ?

Number of molecules = ?

Solution:

Number of moles:

Number of moles = mass/molar mass

Number of moles = 671 g/ 54.091 g/mol

Number of moles = 12.41 mol

Number of molecules:

1 mole contain 6.022×10²³ molecules

12.41 mol × 6.022×10²³ molecules / 1 mol

74.73 ×10²³ molecules

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

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