182k views
7 votes
1) What is the mass of 6.2 mol of K2CO3?

User ILikeTacos
by
7.9k points

1 Answer

13 votes

Answer:


\boxed {\boxed {\sf 856.8648 \ grams \ of \ K_2CO_3}}

Step-by-step explanation:

To convert from moles to grams, we must find the molar mass.

1. Molar Mass

First, identify the elements in the compound. K₂CO₃ It has potassium, carbon, and oxygen. Find these elements and their masses on the Periodic Table.

  • K: 39.098 g/mol
  • C: 12.011 g/mol
  • O: 15.999 g/mol

Note the subscript of 2 after K and 3 after O. We must multiply oxygen's molar mass by 2, then oxygen's by 3, and add carbon.

  • 2(39.098 g/mol) + 3(15.999 g/mol) + 12.011 g/mol= 138.204 g/mol

2. Convert Moles to Grams

Use the molar mass as a fraction.


\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}

Multiply by the given number of moles: 6.2


6.2 \ mol \ K_2CO_3 *\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}


6.2 *\frac {138.204 \ g \ K_2CO_3}{1 }


6.2 * {138.204 \ g \ K_2CO_3}


856.8648 \ g \ K_2CO_3

There are 856.8648 grams of potassium carbonate in 6.2 moles.

User Sithys
by
8.8k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.