Use the equation below to answer the following question. How many grams of calcium chloride are produced from 19.3 g of HCl?
2HCl + Ca(OH)2 à 2H2O + CaCl2
Give your answer in correct sig digs and correct label.
mols HCl = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols HCl to mols CaCl2.
Now convert mols CaCl2 to grams CaCl2. g = mols x molar mass
To determine how many grams of calcium chloride (CaCl2) are produced from 19.3 g of hydrochloric acid (HCl), we need to use the balanced chemical equation provided:
2HCl + Ca(OH)2 -> 2H2O + CaCl2
The stoichiometry of the equation tells us that for every 2 moles of HCl, we obtain 1 mole of CaCl2.
To solve the problem, follow these steps:
Step 1: Find the molar mass of HCl
The molar mass of HCl is calculated by adding up the atomic masses of hydrogen (H) and chlorine (Cl).
Molar mass of HCl = (1.007 g/mol) + (35.453 g/mol) = 36.46 g/mol
Step 2: Convert grams of HCl to moles
Use the formula:
moles = mass (g) / molar mass (g/mol)
moles of HCl = 19.3 g / 36.46 g/mol = 0.529 mol HCl
Step 3: Calculate moles of CaCl2
Since the stoichiometric ratio is 2 moles of HCl to 1 mole of CaCl2, we multiply the moles of HCl by the ratio:
moles of CaCl2 = 0.529 mol HCl * (1 mol CaCl2 / 2 mol HCl) = 0.265 mol CaCl2
Step 4: Convert moles of CaCl2 to grams
Use the formula:
mass (g) = moles * molar mass (g/mol)
mass of CaCl2 = 0.265 mol * 110.98 g/mol = 29.5 g CaCl2
Therefore, 19.3 g of HCl would produce 29.5 g of CaCl2. The answer, considering the correct significant figures, would be 29.5 g CaCl2.