High School

What is the mass of 4.55 moles of [tex]$CH_2O$[/tex]?

The molar mass of [tex]$CH_2O$[/tex] is [tex]$30.03 \, \text{g/mol}$[/tex].

1. 179 g
2. 0.152 g
3. 137 g
4. 22.9 g
5. 39.3 g
6. 104 g

Answer :

To find the mass of 4.55 moles of [tex]\( \text{CH}_2\text{O} \)[/tex], you need to use the formula:

[tex]\[ \text{mass} = \text{moles} \times \text{molar mass} \][/tex]

Here's how you can do it:

1. Identify the given information:
- Number of moles of [tex]\( \text{CH}_2\text{O} \)[/tex] = 4.55
- Molar mass of [tex]\( \text{CH}_2\text{O} \)[/tex] = 30.03 grams per mole

2. Use the formula to calculate the mass:

[tex]\[
\text{mass} = 4.55 \, \text{moles} \times 30.03 \, \text{g/mol}
\][/tex]

3. Perform the multiplication:

[tex]\[
\text{mass} = 136.6365 \, \text{grams}
\][/tex]

The closest answer to the calculated mass is 137 grams. Therefore, the mass of 4.55 moles of [tex]\( \text{CH}_2\text{O} \)[/tex] is approximately 137 grams.

So, the correct choice is option 3: 137 g.

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