Please help me. I have worked on this for 2 days. I don't understand the ratio of this equation.4Na+O2 to 2Na2O.
for question: How many grams of Na2O are produced when 81.ograms of Na reacts?
A four step procedure will work these problems.
1. Write and balance the equation.
You have that.
2. Convert what you have (in this case 81.0 g Na) to mols. mol = grams/molar mass = ?
3. Using the coefficients in the balanced equation, convert mols of what you have (Na) to mols of what you want (in this case Na2O).
?mols Na x (2 mols Na2O/4 mols Na) = ? mols Na x (2/4) = ? mols Na x 1/2 = ?
4. Now convert mols of what you want (Na2O) to grams. g = mols x molar mass
How many moles of aluminum ions are present in 0.50 mole of Al2(SO4)3?
To solve this question, we need to understand the ratio of the equation 4Na + O2 → 2Na2O and use it to calculate the mass of Na2O produced when 81.0 grams of Na reacts.
The ratio in the equation tells us that for every 4 moles of Na, 2 moles of Na2O are produced. We can use this ratio to convert grams of Na to moles of Na, and then convert moles of Na2O to grams of Na2O.
Here's how you can solve it step by step:
Step 1: Find the molar mass of Na.
The molar mass of Na is 22.99 g/mol.
Step 2: Calculate the moles of Na.
Moles = Mass / Molar Mass
Moles = 81.0 g / 22.99 g/mol ≈ 3.52 mol (rounded to two decimal places)
Step 3: Use the ratio to determine the moles of Na2O.
From the balanced equation, we know that:
4 moles of Na react to produce 2 moles of Na2O.
To find the moles of Na2O produced, we can set up a proportion:
4 moles Na / 2 moles Na2O = 3.52 moles Na / x moles Na2O
Cross multiplying, we get:
4 moles Na * x moles Na2O = 2 moles Na2O * 3.52 moles Na
x moles Na2O = (2 moles Na2O * 3.52 moles Na) / 4 moles Na
x moles Na2O = 1.76 moles Na
Step 4: Convert moles of Na2O to grams of Na2O.
Molar mass of Na2O = 61.98 g/mol
Mass = Moles * Molar Mass
Mass = 1.76 moles Na2O * 61.98 g/mol = 108.89 grams Na2O (rounded to two decimal places)
Therefore, when 81.0 grams of Na reacts, approximately 108.89 grams of Na2O are produced.