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Mass conversion is simply turning the mass of a substance from one unit of measurement to another. In many science problems, mass may be provided in kilograms but sometimes you might need to convert it to grams to match the units used for other measurements like density. For example, in the context of the ethyl acetate problem, we began with a mass of 0.070 kilograms. To convert this to grams, you use the conversion factor that 1 kilogram equals 1000 grams.
So you multiply:

• 0.070 kg by 1000.

This gives you 70 grams, which makes it easier to use with the given density in grams per milliliter. Understanding mass conversion is crucial when dealing with different unit systems, especially in chemistry and physics, because it ensures all the measurements are compatible for calculations.

Finding the volume of a substance becomes straightforward once you have the mass and the density. In scientific terms, density is defined as mass divided by volume: \[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]To find volume, you rearrange the formula: \[ \text{Volume} = \frac{\text{Mass}}{\text{Density}} \]This shows volume can be calculated by dividing the mass by the density of the substance. In the ethyl acetate example, with a mass of 70 grams and density of 0.902 grams per milliliter, you substitute the values:

• Mass = 70 g
• Density = 0.902 g/mL

Thus the calculation is:\[ \text{Volume} = \frac{70}{0.902} \approx 77.59 \text{ mL} \]This calculation gives us the volume in milliliters. Knowing how to determine volume is essential for tasks that involve mixing solutions or calculating required quantities of a material.

Unit conversion is the process of changing the measurement of a quantity from one unit to another while maintaining the same amount. Often, substances are measured in different units, and you need to convert these to work out problems correctly. For volume, you might need to switch between milliliters and liters.
When working with the ethyl acetate problem, you end up with a volume of 77.59 milliliters. Since some situations prefer liters, knowing that 1 liter equals 1000 milliliters is key:

• Divide 77.59 mL by 1000 to convert it to liters.

This gives you approximately 0.07759 liters. Unit conversion is useful in many scientific disciplines, including chemistry and physics, where understanding and working with different units can affect the precision and success of your calculations.