20 grams magnesium metal react with excess oxygen and 28 grams of magnesium oxide are produced in lab what is percent yield?
If 99.8 g of aluminum nitrate are reacted with excess sulfuric acid what would be the theoretical yield in grams of aluminum sulfate?
i have done both of these problems a million times and have been working on this homework since i got home at 4:30 please just help me be done so i can relax for the evening
So post what you've done and we can direct you where you've gone wrong.
idk. lol from 4 years ago
I'm sorry to hear that you're feeling overwhelmed. I'm here to help! Let's break down each problem step-by-step so you can understand and solve them more easily.
1. For the first problem:
To calculate the percent yield, we need to compare the actual yield to the theoretical yield. The theoretical yield is the maximum amount of product that can be obtained according to the balanced chemical equation.
Given:
Mass of magnesium = 20 g
Mass of magnesium oxide produced = 28 g
To find the percent yield, follow these steps:
1. Calculate the molar mass of magnesium (Mg) and magnesium oxide (MgO).
2. Convert the mass of magnesium to moles using the molar mass of magnesium.
3. Use the mole ratio from the balanced chemical equation to determine the number of moles of magnesium oxide expected.
4. Convert the moles of magnesium oxide to grams using the molar mass of magnesium oxide.
5. Calculate the percent yield using the formula: (Actual yield / Theoretical yield) x 100%
Now let's move on to the second problem:
2. For the second problem:
To determine the theoretical yield, we need to use the balanced chemical equation and stoichiometry.
Given:
Mass of aluminum nitrate (Al(NO3)3) = 99.8 g
Reacting with excess sulfuric acid (H2SO4)
To find the theoretical yield, follow these steps:
1. Write the balanced chemical equation for the reaction between aluminum nitrate and sulfuric acid.
2. Calculate the molar mass of aluminum nitrate (Al(NO3)3) and aluminum sulfate (Al2(SO4)3).
3. Convert the mass of aluminum nitrate to moles using the molar mass.
4. Use the mole ratio from the balanced chemical equation to determine the number of moles of aluminum sulfate expected.
5. Convert the moles of aluminum sulfate to grams using the molar mass.
By following these steps, you can calculate the theoretical yield of aluminum sulfate.