This is due online in 20 minutes and I've been working on it for 3 hours. Im lost on what to do with this question. Please help
How much H2 gas at STP can be produced by the reaction
2Na(s) + 2H2O(§¤) -> H2(g) + 2NaOH(aq)
of 3.80 g of Na and excess water?
Answer in units of L
mols Na = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols Na to mols H2.
Then convert mols H2 to L H2 by L H2 = mols H2 x 22.4 L/mol = ?
Approx 2 L if I didn't punch in something wrong on the calculator.
To find out how much H2 gas can be produced by this reaction, we need to follow a few steps:
Step 1: Balance the Chemical Equation
The given chemical equation is already balanced. It shows that 2 moles of Na react with 2 moles of H2O to produce 1 mole of H2 gas.
Step 2: Convert Grams of Na to Moles
Given that you have 3.80 g of Na, you need to convert this amount to moles. The molar mass of Na is approximately 23 g/mol.
Moles of Na = (Mass of Na) / (Molar mass of Na)
Moles of Na = (3.80 g) / (23 g/mol)
Step 3: Determine the Limiting Reagent
To determine the limiting reagent, you need to compare the moles of Na with the moles of H2O.
From the balanced equation, we know that 2 moles of Na react with 2 moles of H2O to produce 1 mole of H2 gas. This means the mole ratio of Na to H2O is 1:1.
If the moles of Na are equal to or greater than the moles of H2O, then Na is the limiting reagent. If the moles of Na are less than the moles of H2O, then H2O is the limiting reagent.
Step 4: Calculate Moles of H2 Gas
Since H2O is in excess, we can assume that all the moles of Na will react and be consumed.
Moles of H2 = (Moles of Na) / (Mole ratio of H2 : Na)
Moles of H2 = (moles of Na) / (2 moles of Na/1 mol of H2)
Step 5: Convert Moles of H2 Gas to Liters
To convert moles of H2 gas to liters at STP (Standard Temperature and Pressure), you can use the molar volume of gas, which is approximately 22.4 L/mol.
Volume of H2 gas = (Moles of H2) * (Molar volume of gas at STP)
Volume of H2 gas = (moles of H2) * (22.4 L/mol)
Now you can calculate the volume of H2 gas at STP using the moles of Na you obtained earlier.
Note: If you are using a periodic table with different molar masses or different values for the molar volume of gas at STP, make sure to adjust the calculations accordingly.
Once you have the volume of H2 gas in liters, round your answer to the appropriate number of significant figures.