For the following equation, how many grams of NO2 can be formed from 2.50 g of CuO mixed
with 0.500 L of NO gas at 25 C and 1.12 atm. ?
2 CuO (s) + NO (g) Cu2O (s) + NO2 (g
This is a limiting reagent problem and you know that when amounts are given for BOTH reactants.
Convert 2.50 g CuO to mols. mols = grams/molar mass = ?
Convert 0.5 L NO gas to mols (n) using PV = nRT
Using the coefficients in the balanced equation, convert mols CuO to mols of the product, NO2.
Do the same with mols NO to mols NO2.
It is likely that these two values for mols NO2 will not agree. The correct value in limiting regent problems is ALWAYS the smaller value and the reagent responsible for that value is the limiting reagent.
Using the smaller value, convert that to grams. g = mols x molar mass = ?
To find out how many grams of NO2 can be formed from the given reaction, we need to use the concept of stoichiometry. Stoichiometry is the calculation of quantities in chemical reactions, based on balanced equations. Here's how you can solve this problem step-by-step:
1. Write the balanced equation:
2 CuO (s) + NO (g) -> Cu2O (s) + NO2 (g)
2. Convert the given mass of CuO into moles. To do this, divide the given mass of CuO by its molar mass. The molar mass of CuO can be calculated from the atomic masses of copper (Cu) and oxygen (O), which can be found on the periodic table.
3. Convert the given volume of NO gas into moles. To do this, we need to use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we can rearrange the equation to solve for n: n = PV / RT.
- Convert the given pressure of NO gas from atm to Pa (1 atm = 101325 Pa).
- Convert the given temperature from Celsius to Kelvin (K = °C + 273.15).
- Substitute the values into the equation n = (P * V) / (R * T) to get the number of moles of NO gas.
4. Use the stoichiometry of the balanced equation to determine the mole ratio of CuO to NO2. From the balanced equation, we can see that the ratio is 2:1, meaning that for every 2 moles of CuO, 1 mole of NO2 is formed.
5. Calculate the moles of NO2 formed by multiplying the number of moles of CuO (from step 2) by the mole ratio from step 4.
6. Convert the moles of NO2 to grams by multiplying the number of moles by the molar mass of NO2, which can be calculated from the atomic masses of nitrogen (N) and oxygen (O), found on the periodic table.
By following these steps, you can find the number of grams of NO2 formed from the given reaction.