Answer:
The answer is 0.000465 moles.
Step-by-step explanation:
To calculate the number of moles corresponding to 27.2 milligrams of sodium chloride, we need to use the equation:
Number of moles = Mass of substance / Molar mass
First, we need to determine the molar mass of sodium chloride (NaCl). Sodium (Na) has a molar mass of 22.99 g/mol, and chlorine (Cl) has a molar mass of 35.45 g/mol. Adding these values together, we get the molar mass of sodium chloride as 58.44 g/mol.
Now, we can use the equation to calculate the number of moles:
Number of moles = 27.2 mg / 58.44 g/mol
Before we proceed with the calculation, we need to convert milligrams (mg) to grams (g) to maintain consistency in units. There are 1000 milligrams in 1 gram, so:
27.2 mg = 27.2 / 1000 g = 0.0272 g
Now we can substitute the values into the equation:
Number of moles = 0.0272 g / 58.44 g/mol
Dividing 0.0272 g by 58.44 g/mol, we get the number of moles:
Number of moles = 0.000465 mol (rounded to 4 decimal places)