Question

How many atoms of hydrogen are in 5.29 × 10²1 molecules of ethanol (CH₃CH₂OH)?

A) 9.89 × 10²²
B) 6.36 × 10²²
C) 1.59 × 10²²
D) 3.18 × 10²²

Answer 1

To calculate the number of hydrogen atoms in 5.29 × 10²¹ molecules of ethanol (CH₃CH₂OH), multiply the number of molecules by the six hydrogen atoms per molecule, resulting in 3.18 × 10²² hydrogen atoms (answer choice D).

Step-by-step explanation:

The question asks how many atoms of hydrogen are in 5.29 × 10²¹ molecules of ethanol (CH₃CH₂OH). To find this, we look at the molecular formula of ethanol, which shows there are six hydrogen atoms for every ethanol molecule. Multiplying the number of ethanol molecules by the number of hydrogen atoms in each molecule will give us the total number of hydrogen atoms.

Step-by-step calculation:

1. Identify the number of hydrogen atoms per ethanol molecule: CH₃CH₂OH has 6 H atoms.
2. Multiply the number of ethanol molecules by 6 (the number of H atoms per molecule): 5.29 × 10²¹ molecules × 6 H/molecule.
3. Calculate the total number of hydrogen atoms: 5.29 × 10²¹ × 6 = 3.174 × 10²² H atoms.

Therefore, the answer is 3.18 × 10²² hydrogen atoms, which corresponds to answer choice D.