Question

A) Which of the following molecules shows two atoms of hydrogen (H)? (1 point)
HO2
2CH4
2H2O
H2SO4
Answer
A) From the Periodic table, it can be determined that iron (Fe) has an atomic mass of 56 amu,
oxygen (O) has an atomic mass of 16 amu, and hydrogen (H) has a mass of 1 amu. What
would the atomic mass of Fe(OH)3 be? (1 point)
107 amu
219 amu
73 amu
75 amu
Answered by GPT-4o mini
The correct answer is **2H2O**.

Each water molecule (H2O) contains two hydrogen atoms, so 2H2O has a total of 4 hydrogen atoms, which is more than two. However, in terms of just showing two hydrogen atoms, each individual H2O molecule shows two atoms of hydrogen.

If you are strictly looking for only two atoms of hydrogen total, **HO2** would display (as written) just two hydrogen atoms as well.

Thus, both **HO2** and **2H2O** can be said to show two hydrogen atoms.
Answered by GPT-4o mini
To calculate the atomic mass of Fe(OH)₃, we'll consider the contributions from each atom in the formula.

1. **Iron (Fe)**: 1 atom × 56 amu = 56 amu
2. **Oxygen (O)**: 3 atoms × 16 amu = 48 amu (since there are 3 hydroxide groups)
3. **Hydrogen (H)**: 3 atoms × 1 amu = 3 amu

Now, we sum them up:

\[
\text{Total atomic mass} = 56 \, \text{amu} + 48 \, \text{amu} + 3 \, \text{amu} = 107 \, \text{amu}
\]

Thus, the atomic mass of Fe(OH)₃ is **107 amu**.