# Chemistry with a mass question?

• Complexity
In summary, mass in chemistry is the amount of matter in an object, measured in grams or kilograms using a balance or scale. It is related to weight, which is the force of gravity acting on an object, but they are not interchangeable. Mass also plays a crucial role in chemical reactions and can be used to identify substances in analytical chemistry.
Complexity

## Homework Statement

http://img842.imageshack.us/i/cusersbenappdatalocalte.png/

## The Attempt at a Solution

The work is inside the link. I am just wondering how 4.09 grams is obtained? Like how did the person know to take out 4.09 grams?

Very likely in parts a or b which we can't see.

If you are too lazy to copy questions, I am too lazy to think about the answer.

## 1. What is the definition of mass in chemistry?

Mass in chemistry refers to the amount of matter an object contains. It is a measure of the quantity of particles, such as atoms and molecules, that make up a substance.

## 2. How is mass measured in chemistry?

In chemistry, mass is typically measured in grams (g) or kilograms (kg) using a balance or scale. It can also be measured in atomic mass units (amu) for very small particles.

## 3. What is the relationship between mass and weight in chemistry?

In chemistry, mass and weight are often used interchangeably, but they are not the same. Mass is a measure of the amount of matter, while weight is a measure of the force of gravity acting on an object. The weight of an object can vary depending on its location, but its mass will remain constant.

## 4. How does mass affect chemical reactions?

The mass of reactants in a chemical reaction will determine the amount of product that can be produced. This is known as the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed.

## 5. How can mass be used to identify substances in chemistry?

In chemistry, the mass of an element or compound can be used to determine its identity. This is because each element and compound has a unique mass, which can be used to calculate its molar mass and compare it to known values. This is often used in analytical chemistry and identification of unknown substances.

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