The concentration of sodium chloride in ocean water is on average 0.060 M. What mass of sodium chloride is present in 25 L of ocean water?
How do I answer this question, I have no idea where even to start.
Molarity is the number of moles of solute dissolved in one liter of solution. The units, therefore are moles per liter
so if you have .060 moles per liter and you have 25 liters, how many moles of NaCl do you have? now use the molar mass of NaCl to determine the mass.
To answer this question, we can use the molarity (M) of sodium chloride in ocean water and the volume of ocean water given.
First, let's understand what molarity (M) means in terms of concentration. Molarity represents the number of moles of a solute (sodium chloride in this case) dissolved in one liter of a solution (ocean water). Therefore, 0.060 M sodium chloride means that there are 0.060 moles of sodium chloride dissolved in one liter of ocean water.
Next, we need to convert the volume of ocean water from liters to milliliters (mL) because the molarity is given in moles per liter. To do this, multiply the volume (25 L) by 1000 to get the volume in mL: 25 L * 1000 mL/L = 25,000 mL.
Now, we can determine the total number of moles of sodium chloride in the given volume of ocean water. To do this, multiply the molarity (0.060 M) by the volume in liters (25 L): 0.060 moles/L * 25 L = 1.5 moles.
Finally, we can calculate the mass of sodium chloride by multiplying the number of moles by the molar mass of sodium chloride (NaCl). The molar mass of NaCl is approximately 58.44 g/mol. Therefore, the mass of sodium chloride can be found as follows: 1.5 moles * 58.44 g/mol = 87.66 grams.
So, there are approximately 87.66 grams of sodium chloride present in 25 liters of ocean water.