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## FAQ

**How do you calculate percent by mass?**

The definition of mass is the quantity of matter in an object, which can be calculated by multiplying the volume of the object by its density. The definition of percent by mass is the percentage of a substance’s mass to the total mass. Mass can be converted to volume using density, and vice versa.

**How do you calculate weight from mass?**

To calculate the weight of an object from its mass, you need to know the acceleration due to gravity, which is 9.8 meters per second squared on Earth. Multiply this by the mass of the object and divide by 1000.

**What is formula for mass?**

The formula for mass is the following:

m = m/kg

where m is the mass in kilograms and kg is the unit of kilograms.

**How do you calculate MZ?**

MZ is the abbreviation for monozygotic twins, which are formed when one fertilized egg splits into two.

The MZ twin type is determined by the moment when the egg splits. If the egg splits before day 13 of gestation, the twins are monoamniotic (MA), if it happens after day 13 they are diamniotic (DA).

**What is wt% in chemistry?**

wt% is a unit of mass percentage. It is the percentage by weight of the substance in a mixture.

**How do you write an empirical formula from mass percent?**

To write an empirical formula from mass percent, you must first convert the mass % into moles.

For example, if a compound is 75% carbon, 25% hydrogen and 0% oxygen, then its empirical formula would be C2H6O.

**How do you find mass from pounds?**

Mass is a measure of the amount of matter in an object. When you convert pounds to kilograms, you divide by 2.2 to get the mass in kilograms.

**How do you find weight from mass in chemistry?**

In chemistry, the atomic mass unit (amu) is a unit of mass that expresses the number of protons and neutrons in an atom’s nucleus. In chemistry, mass is measured in units such as grams, kilograms, and milligrams.

**What is the mass of 1 pound?**

1 pound is equivalent to 0.45359237 kilograms.

**What is the formula mass of NaCl?**

The formula mass of NaCl is 58.4g/mol, which is the same as the molecular weight.