2 g of glycine (C2H5NO2) are dissolved in water to a total volume of 3 L. What is the concentration of the glycine solution in M? Round answers to two significant figures.
Molarity=mass/MW / 3
= 2/(3*75) check my molmass.
Molarity = (mass/Molarmass)/3
= (2/75)/3
= 0.0267/3
= 0.0089
= 0.01 M
To calculate the concentration of the glycine solution in Molarity (M), we need to determine the number of moles of glycine in the solution.
First, we need to convert the mass of glycine from grams to moles by using its molar mass.
The molar mass of glycine (C2H5NO2) can be calculated as follows:
C: 12.01 g/mol
H: 1.01 g/mol (x2)
N: 14.01 g/mol
O: 16.00 g/mol (x2)
Molar mass of glycine (C2H5NO2) = (12.01 x 2) + (1.01 x 5) + 14.01 + (16.00 x 2) = 75.07 g/mol
Next, we can calculate the number of moles of glycine dissolved in the solution:
moles of glycine = mass of glycine / molar mass of glycine
moles of glycine = 2 g / 75.07 g/mol = 0.02665 mol (rounded to 5 decimal places)
Finally, to find the concentration in Molarity (M), we divide the number of moles of glycine by the volume of the solution in liters.
Molarity (M) = moles of glycine / volume of solution in liters
Molarity (M) = 0.02665 mol / 3 L = 0.00888 M (rounded to 2 significant figures)
Therefore, the concentration of the glycine solution is approximately 0.00888 M.
To find the concentration of the glycine solution in M (molarity), we need to know the amount of glycine in moles and the volume of the solution in liters.
1. Convert the mass of glycine to moles:
The molar mass of glycine (C2H5NO2) can be computed by adding the atomic masses of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O):
C: 12.01 g/mol
H: 1.01 g/mol
N: 14.01 g/mol
O: 16.00 g/mol
Molar Mass of glycine = (2 * 12.01) + (5 * 1.01) + 14.01 + (2 * 16.00) g/mol
= 46.07 g/mol
Now, we can calculate the moles of glycine by dividing the given mass of glycine by its molar mass:
moles of glycine = mass of glycine / molar mass of glycine
= 2 g / 46.07 g/mol
2. Calculate the concentration of the glycine solution:
Molarity (M) is a measure of the number of moles of solute per liter of solution. Based on the given information, we have:
Volume of the solution = 3 L
Concentration (M) = moles of glycine / volume of the solution
= (2 g / 46.07 g/mol) / 3 L
Finally, we can calculate the concentration by dividing the moles of glycine by the volume of the solution.
Now you can perform the calculations using a calculator to get the concentration of the glycine solution in M, rounding the answer to two significant figures.