In the reaction 2H2 + O2 → 2H2O, how many grams of oxygen are required to react with 4 grams of hydrogen?
Practice Questions
1 question
Q1
In the reaction 2H2 + O2 → 2H2O, how many grams of oxygen are required to react with 4 grams of hydrogen?
16 g
8 g
4 g
2 g
First, calculate moles of H2: 4 g / 2 g/mol = 2 moles. From the reaction, 2 moles of H2 require 1 mole of O2. Therefore, 2 moles of O2 = 32 g.
Questions & Step-by-step Solutions
1 item
Q
Q: In the reaction 2H2 + O2 → 2H2O, how many grams of oxygen are required to react with 4 grams of hydrogen?
Solution: First, calculate moles of H2: 4 g / 2 g/mol = 2 moles. From the reaction, 2 moles of H2 require 1 mole of O2. Therefore, 2 moles of O2 = 32 g.
Steps: 6
Step 1: Find the molar mass of hydrogen (H2). The molar mass of H is about 1 g/mol, so H2 is 2 g/mol.
Step 2: Calculate the number of moles of hydrogen in 4 grams. Use the formula: moles = mass / molar mass. So, moles of H2 = 4 g / 2 g/mol = 2 moles.
Step 3: Look at the balanced chemical equation: 2H2 + O2 → 2H2O. This tells us that 2 moles of H2 react with 1 mole of O2.
Step 4: Since we have 2 moles of H2, we need half that amount of O2. So, 2 moles of H2 require 1 mole of O2.
Step 5: Find the molar mass of oxygen (O2). The molar mass of O is about 16 g/mol, so O2 is 32 g/mol.
Step 6: Calculate the mass of oxygen needed. Since we need 1 mole of O2, the mass of O2 = 1 mole * 32 g/mol = 32 grams.
