One atomic mass is equal to

Options

A. `1.66xx10^(-27)g`
B. `1.66xx10^(-24)g`
C. `1.66xx10^(-23)g`
D. `1.66xx10^(-25)g`

Answer

To solve the question "One atomic mass is equal to," we will follow these steps:

### Step 1: Understand the Definition of Atomic Mass
Atomic mass (amu) is defined as one twelfth (1/12) of the mass of a carbon-12 atom. This is a standard reference in chemistry.

### Step 2: Calculate the Mass of One Atomic Mass Unit
Using the definition:
- 1 amu = (1/12) × mass of one carbon-12 atom

### Step 3: Find the Mass of a Carbon-12 Atom
The mass of a carbon-12 atom is approximately 12 atomic mass units. Therefore:
- 1 amu = (1/12) × 12 amu = 1 amu

### Step 4: Convert Atomic Mass to Grams
The mass of one atomic mass unit can also be expressed in grams:
- 1 amu ≈ 1.66 × 10^-24 grams

### Step 5: Convert to Kilograms
To express this in kilograms:
- 1 amu ≈ 1.66 × 10^-27 kg

### Step 6: Identify the Correct Option
From the options provided, we need to identify which one corresponds to the calculated value of 1 amu in grams or kilograms. The correct option will be the one that states:
- 1 amu = 1.66 × 10^-24 grams

### Final Answer
Thus, the answer to the question is that one atomic mass unit (amu) is equal to approximately 1.66 × 10^-24 grams.

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