How many molecules are in 54.0 grams of CO2?

The number of molecules in 54 grams of CO2 is 7.39 × 10²³ molecules.  

•To find the number of molecules, first there is a need to find the number of moles in a substance.  

•Moles are determined by using the formula, mass of substances/molecular weight of the substance.  

•The molecular weight of CO2 is 44 gram per mole.  

•So, the number of moles will be,  

Number of moles = 54 g/44 g/mol = 1.227 moles

Now to determine the molecules, there is a need to multiply the moles with the Avogadro's constant, that is, 6.022 × 10²³. This comes out to be as,  

= 1.227 moles × 6.022 × 10²³  

= 7.39 × 10²³ molecules

Thus, the number of molecules in 54 grams of CO2 is 7.39 × 10²³ molecules.

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7.38654 in 54 grams

Explanation:

To get moles, you divide grams of a substance by molecular weight. The molecular weight of CO2 is 44 g/mol. 54g divided by 44/mol  is 1.227moles.

You then need to multiply moles by Avogadro’s constant (6.022x10^23). That gives you 7.38654x10^23 molecules in 54 grams of CO2.

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

the answer is c. nacl