In the reaction 2H2 + O2 → 2H2O, how many grams of water can be produced from 4

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Question: In the reaction 2H2 + O2 → 2H2O, how many grams of water can be produced from 4 grams of hydrogen?

Options:

Correct Answer: 36 g

Solution:

4 g of H2 = 2 moles. 2 moles of H2 produce 2 moles of H2O = 2 * 18 g = 36 g.

In the reaction 2H2 + O2 → 2H2O, how many grams of water can be produced from 4 grams of hydrogen?

In the reaction 2H2 + O2 → 2H2O, how many grams of water can be produced from 4 grams of hydrogen?

Step 1: Determine the molar mass of hydrogen (H2). The molar mass of hydrogen is approximately 1 g/mol, so H2 (which has 2 hydrogen atoms) has a molar mass of 2 g/mol.
Step 2: Calculate the number of moles of hydrogen in 4 grams. Use the formula: moles = mass (g) / molar mass (g/mol). So, moles of H2 = 4 g / 2 g/mol = 2 moles.
Step 3: Use the balanced chemical equation 2H2 + O2 → 2H2O to find the relationship between hydrogen and water. From the equation, 2 moles of H2 produce 2 moles of H2O.
Step 4: Since 2 moles of H2 produce 2 moles of H2O, we can conclude that 2 moles of H2 will produce 2 moles of H2O.
Step 5: Calculate the mass of water produced. The molar mass of water (H2O) is approximately 18 g/mol. Therefore, 2 moles of H2O = 2 * 18 g = 36 g.
Step 6: Conclude that from 4 grams of hydrogen, 36 grams of water can be produced.

Stoichiometry – The calculation of reactants and products in chemical reactions based on balanced equations.
Molar Mass – Understanding the mass of one mole of a substance, which is essential for converting between grams and moles.
Mole Ratio – Using the coefficients from the balanced equation to determine the relationship between moles of reactants and products.