Express each aqueous concentration in the unit indicated.
45 ppm NO3 -, as molarity of nitrate ion in [mol NO3 - /L].
A good conversion factor to remember is this.
1 ppm = 1 mg/L
So 45 ppm = 45 mg/L.
Convert mg to g, then divide by molar mass NO3^- to convert to mols and you have it.
45mgNO3 /1moleNO3 / 1moleN / 14g /10mgLN L 62 g 1 mole NO3 1 mole N
=10 mg/L nitrate as nitrogen (NO3-N)
How many atoms are in 0.075 mol of titanium?
2.2 × 1024
4.5 × 1022
1.2 × 10–25
6.4 × 102
To express the concentration of a substance in a different unit, you need to know the molar mass of the substance. In this case, to express the concentration of NO3- in molarity, you need to convert ppm (parts per million) to molarity.
Here's how you can do it:
Step 1: Convert ppm to mg/L
First, you need to convert ppm to milligrams per liter (mg/L). Since 1 ppm is equivalent to 1 mg/L for water and aqueous solutions, you can directly convert 45 ppm to 45 mg/L.
Step 2: Convert mg/L to moles per liter (Molarity)
Since the molar mass of NO3- (nitrate ion) is 62.0049 g/mol, you can convert the concentration from mg/L to moles per liter (Molarity) using the following formula:
Molarity = (Concentration in mg/L) / (Molar mass in g/mol)
Molarity = (45 mg/L) / (62.0049 g/mol)
Step 3: Convert g/mol to mol/L
Finally, divide the molar mass by 1000 to convert grams to kilograms and convert the volume from liters to cubic meters using the following formula:
Molarity = (Concentration in mg/L) / (Molar mass in g/mol) / 1000
Molarity = (45 mg/L) / (62.0049 g/mol) / 1000
Simplifying the calculation, you will get the concentration of NO3- in [mol NO3- / L].