Question

rocket engines can be fueled by liquid hydrogen. the liquid hydrogen reacts with liquid oxygen, producing water vapor and releasing an enormous amount of energy. consider the following reaction: 4 molecules of hydrogen (h₂) react with 2 molecules of oxygen (o₂) to produce some amount of water (h₂o). complete the table below. chemical element | number of atoms in the reaction h | o | during this reaction, how many molecules of water (h₂o) are produced? submit work it out not feeling ready yet? this can help: count atoms and molecules in chemical reactions (100)

Explanation:

Part 1: Counting Atoms of H and O

Step 1: Calculate number of H atoms

Each \( H_2 \) molecule has 2 H atoms. There are 4 \( H_2 \) molecules. So total H atoms: \( 2\times4 = 8 \).

Step 2: Calculate number of O atoms

Each \( O_2 \) molecule has 2 O atoms. There are 2 \( O_2 \) molecules. So total O atoms: \( 2\times2 = 4 \).

Part 2: Number of \( H_2O \) Molecules Produced

Step 1: Recall the chemical reaction

The reaction is \( 2H_2 + O_2
ightarrow 2H_2O \) (simplified from 4 \( H_2 \) and 2 \( O_2 \), we can divide by 2). But using the given amounts: 4 \( H_2 \) (which is \( 2\times2 H_2 \)) and 2 \( O_2 \). From the reaction, 2 \( H_2 \) reacts with 1 \( O_2 \) to form 2 \( H_2O \). So 4 \( H_2 \) (which is 2 sets of 2 \( H_2 \)) and 2 \( O_2 \) (2 sets of 1 \( O_2 \)) will form \( 2\times2 = 4 \) \( H_2O \) molecules? Wait, no. Wait, the balanced equation for \( H_2 \) and \( O_2 \) is \( 2H_2 + O_2 = 2H_2O \). So if we have 4 \( H_2 \) (which is \( 2\times2 H_2 \)) and 2 \( O_2 \) ( \( 2\times1 O_2 \) ), then the number of \( H_2O \) formed is \( 2\times2 = 4 \)? Wait, no. Wait, let's use atom conservation. Each \( H_2O \) has 2 H and 1 O. We have 8 H atoms (so number of \( H_2O \) from H: \( 8\div2 = 4 \)) and 4 O atoms (number of \( H_2O \) from O: \( 4\div1 = 4 \)). So the number of \( H_2O \) molecules is 4.

Answer:

s:

• Number of H atoms: 8
• Number of O atoms: 4
• Number of \( H_2O \) molecules: 4

(For the table: H: 8, O: 4; for the molecule count: 4)