treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl.
how many grams of sodium chloride were in the sample?
What is the weight percentage of NaCl in the sample?
Convert 0.7331 g AgCl to g NaCl. The easy way to do that is
0.7331 x (molar mass NaCl/molar mass AgCl) = ?
Then %NaCl = (g NaCl/g sample) x 100 = ??
To determine the grams of sodium chloride in the sample, you need to use stoichiometry and the given information. Here's how you can calculate it:
1. Start by finding the moles of AgCl formed:
- The molar mass of AgCl is 143.32 g/mol (107.87 g/mol for Ag + 35.45 g/mol for Cl).
- Calculate the moles of AgCl using the formula: moles = mass / molar mass.
- Moles of AgCl = 0.7331 g / 143.32 g/mol = 0.005114 mol.
2. Since there is an excess of AgNO3, the moles of AgCl formed are also equal to the moles of NaCl in the sample because of the balanced chemical equation:
AgNO3 + NaCl -> AgCl + NaNO3.
Therefore, moles of NaCl = 0.005114 mol.
3. Calculate the grams of NaCl in the sample:
- The molar mass of NaCl is 58.44 g/mol (22.99 g/mol for Na + 35.45 g/mol for Cl).
- Calculate the mass of NaCl using the formula: mass = moles * molar mass.
- Mass of NaCl = 0.005114 mol * 58.44 g/mol = 0.2979 g.
So, there were approximately 0.2979 grams of sodium chloride in the sample.
To find the weight percentage of NaCl in the sample, use the following formula:
Weight percentage of NaCl = (Mass of NaCl / Mass of sample) * 100.
To calculate the weight percentage, you need the mass of the sample. However, it is not mentioned in the given information. Without the mass of the sample, it is not possible to determine the weight percentage of NaCl in the sample.