Answer :
To find out how many grams of salt (NaCl) are present in 1 liter of ocean water, where the concentration is approximately 0.6 M (molar), follow these steps:
1. Understand Molarity (M):
- Molarity is the number of moles of solute (in this case, NaCl) per liter of solution. Therefore, 0.6 M means there are 0.6 moles of NaCl in every liter of ocean water.
2. Know the Molar Mass of NaCl:
- The molar mass is the weight of one mole of a substance. For NaCl (sodium chloride), the molar mass is approximately 58.5 grams per mole.
3. Calculate the Mass of NaCl:
- Use the formula:
[tex]\[
\text{Mass of NaCl} = \text{Molarity of NaCl} \times \text{Molar Mass of NaCl}
\][/tex]
- Substitute the known values:
[tex]\[
\text{Mass of NaCl} = 0.6 \, \text{moles/L} \times 58.5 \, \text{grams/mole}
\][/tex]
4. Perform the Calculation:
- Multiply:
[tex]\[
0.6 \, \text{moles/L} \times 58.5 \, \text{grams/mole} = 35.1 \, \text{grams}
\][/tex]
So, there are approximately 35.1 grams of salt in 1 liter of ocean water. Therefore, the correct answer is a. 35.1 g.
1. Understand Molarity (M):
- Molarity is the number of moles of solute (in this case, NaCl) per liter of solution. Therefore, 0.6 M means there are 0.6 moles of NaCl in every liter of ocean water.
2. Know the Molar Mass of NaCl:
- The molar mass is the weight of one mole of a substance. For NaCl (sodium chloride), the molar mass is approximately 58.5 grams per mole.
3. Calculate the Mass of NaCl:
- Use the formula:
[tex]\[
\text{Mass of NaCl} = \text{Molarity of NaCl} \times \text{Molar Mass of NaCl}
\][/tex]
- Substitute the known values:
[tex]\[
\text{Mass of NaCl} = 0.6 \, \text{moles/L} \times 58.5 \, \text{grams/mole}
\][/tex]
4. Perform the Calculation:
- Multiply:
[tex]\[
0.6 \, \text{moles/L} \times 58.5 \, \text{grams/mole} = 35.1 \, \text{grams}
\][/tex]
So, there are approximately 35.1 grams of salt in 1 liter of ocean water. Therefore, the correct answer is a. 35.1 g.
