Question

What is the mass of 6.2x1022 molecules of carbon monoxide?

2.9 g

0.028 g

21 g

.70 g

Answer 1

Answer: 2.887 grams

To calculate the mass of a given number of molecules, we need to know the molar mass of the substance.

The molar mass of carbon monoxide (CO) is 28.01 grams per mole.

We can set up a conversion factor to calculate the mass of 6.2x10^22 molecules:

1 mole CO = 28.01 grams CO

Using this conversion factor, we can set up the following calculation:

(6.2x10^22 molecules CO) x (1 mole CO / 6.022x10^23 molecules CO) x (28.01 grams CO / 1 mole CO)

Calculating the above expression gives us:

(6.2x10^22 x 1 x 28.01) / (6.022x10^23 x 1)

Simplifying the calculation, we have:

(173.922x10^22) / (6.022x10^23)

= 2.887 grams

Therefore, the mass of 6.2x10^22 molecules of carbon monoxide is approximately 2.887 grams. None of the provided answer choices match this value exactly.

Answer 2

2.9 g

Step-by-step explanation:

First, find how many moles are present by comparing with Avogadro's Number:

`\tt n = (6.2 * 10^(22))/(6.02 * 10^(23))`

n=0.103

This gives us 0.103 moles of carbon monoxide.

Then, multiply the number of moles by the molar mass of carbon monoxide to find the mass:

The molar mass is 12+ 16=28g/mol

Now,

Finding the mass by multiplying moles by molar mass.

Mass = 0.103 moles * 28 g/mol

This gives us 2.884 grams.

while round off we get 2.9 grams.

Therefore, the mass of 6.2*10^22 molecules of carbon monoxide is 2.9 grams.