Jessica's teacher has asked her to bring her 0.40 moles of sodium chloride to the laboratory. She should bring approximately _______ grams.
To find out the approximate grams of sodium chloride that Jessica should bring, we need to use the molar mass of sodium chloride and the given number of moles.
The molar mass of sodium chloride (NaCl) can be found by adding the atomic masses of sodium (Na) and chlorine (Cl), which are 22.99 g/mol and 35.45 g/mol, respectively.
Mass of NaCl = (22.99 g/mol Na) + (35.45 g/mol Cl)
Mass of NaCl = 58.44 g/mol
Now, we can use the formula:
Mass (in grams) = Number of moles × Molar mass
Substituting the given number of moles:
Mass (in grams) = 0.40 moles × 58.44 g/mol
Calculating:
Mass (in grams) ≈ 23.376 grams
So, Jessica should bring approximately 23.376 grams of sodium chloride to the laboratory.