Answer :
Final answer:
The mass of 12.6 mL of ethanol with a density of 0.789 g/mL is calculated to be 9.9414 grams, which rounds to 9.94 grams when considering three significant digits.
Explanation:
To calculate the mass of 12.6 mL of ethanol, you can use the density of ethanol, which is typically given as 0.789 g/mL at 20 °C. The formula to find mass is:
Mass = Volume × Density
By substituting the given values into the equation:
Mass = 12.6 mL × 0.789 g/mL
When calculated, this results in:
Mass = 9.9414 g
After rounding to three significant digits, the mass of the ethanol is 9.94 grams.
