a 215 ml sample of ocean water contains 7.1g. what is the molarity of nacl
Molarity= (mass/formula mass)/.215
= 7.1/(58*.215)
To calculate the molarity of NaCl, we need to know the molecular weight of NaCl. The molecular weight of NaCl is 58.44 g/mol.
Now, we can use the formula for molarity:
Molarity (M) = moles of solute / volume of solution in liters
First, let's calculate the moles of NaCl using the given mass:
moles of NaCl = mass of NaCl / molecular weight of NaCl
moles of NaCl = 7.1 g / 58.44 g/mol
moles of NaCl = 0.1216 mol
Now, let's convert the volume of the solution to liters:
volume of solution = 215 ml = 215/1000 L = 0.215 L
Finally, we can calculate the molarity:
Molarity (NaCl) = 0.1216 mol / 0.215 L
Molarity (NaCl) ≈ 0.5655 M
Therefore, the molarity of NaCl in the given ocean water sample is approximately 0.5655 M.
To find the molarity of NaCl in the given sample of ocean water, we need to follow these steps:
Step 1: Convert the mass of NaCl (in grams) to moles.
Step 2: Calculate the volume of ocean water in liters.
Step 3: Divide the moles of NaCl by the volume of ocean water (in liters) to obtain the molarity.
Let's proceed with the calculations:
Step 1: Convert the mass of NaCl to moles.
Given: Mass of NaCl = 7.1 g
To convert grams to moles, we need to use the molar mass of NaCl. The molar mass of NaCl is calculated by summing the atomic masses of sodium (Na) and chlorine (Cl).
- Atomic mass of Na = 22.99 g/mol
- Atomic mass of Cl = 35.45 g/mol
Molar mass of NaCl = (1 * Atomic mass of Na) + (1 * Atomic mass of Cl) = 22.99 + 35.45 = 58.44 g/mol
Now we can convert the mass of NaCl to moles using the formula:
Moles of NaCl = Mass of NaCl / Molar mass of NaCl
Moles of NaCl = 7.1 g / 58.44 g/mol
Step 2: Calculate the volume of ocean water in liters.
Given: Volume of ocean water = 215 ml
To use moles in the calculations, we need to convert the volume from milliliters to liters. There are 1000 milliliters in 1 liter, so:
Volume of ocean water = 215 ml / 1000 = 0.215 L
Step 3: Calculate the molarity of NaCl.
To find the molarity, we divide the moles of NaCl by the volume of ocean water (in liters) using the formula:
Molarity (M) = Moles of NaCl / Volume of ocean water (in liters)
Molarity (M) = (7.1 g / 58.44 g/mol) / 0.215 L
Now you can perform the calculation to obtain the molarity of NaCl in the given ocean water sample.