What is the mass of a sample of ammonia that contains 0.750 moles of hydrogen atoms?
The answer is 4.26g, but I do not know how to set up the equation.
Ammonia is NH3.
0.750 mols H atoms x (1 mol NH3/3 mol H atoms) = 0.250 mol NH3
Then g NH3 = mols NH3 x molar mass NH3 = 0.250 x 17 = ?
To calculate the mass of a sample of ammonia that contains 0.750 moles of hydrogen atoms, you need to first determine the molar mass of ammonia (NH3) and then use the mole ratio to find the mass.
1. Find the molar mass of ammonia (NH3):
- The molar mass of nitrogen (N) is 14.01 g/mol.
- The molar mass of hydrogen (H) is 1.01 g/mol.
- Ammonia (NH3) contains three hydrogen atoms, so the molar mass of ammonia is:
Molar mass of ammonia = (1 × molar mass of nitrogen) + (3 × molar mass of hydrogen)
= (1 × 14.01 g/mol) + (3 × 1.01 g/mol)
= 14.01 g/mol + 3.03 g/mol
= 17.04 g/mol
2. Calculate the mass of ammonia:
- Use the formula: Mass = Moles × Molar mass
- Mass of ammonia = 0.750 moles × 17.04 g/mol
= 12.78 g
Therefore, the mass of the sample of ammonia that contains 0.750 moles of hydrogen atoms is 12.78 g, not 4.26 g as stated in your question. Double-check your calculations and the given data to ensure accuracy.
To determine the mass of a sample of ammonia, you need to use the molar mass of ammonia and the number of moles of hydrogen atoms present in the sample. The molar mass of ammonia (NH3) can be calculated by adding up the atomic masses of nitrogen (N) and three hydrogen atoms (H).
1. First, let's find the molar mass of ammonia:
- The atomic mass of nitrogen (N) is approximately 14.01 g/mol.
- The atomic mass of hydrogen (H) is approximately 1.01 g/mol.
- Since ammonia (NH3) has one nitrogen atom and three hydrogen atoms, you need to multiply the atomic mass of nitrogen by 1 and the atomic mass of hydrogen by 3, then add them together.
Molar mass of ammonia = (1 * atomic mass of nitrogen) + (3 * atomic mass of hydrogen)
Molar mass of ammonia = (1 * 14.01 g/mol) + (3 * 1.01 g/mol)
2. Calculate the molar mass of ammonia.
Molar mass of ammonia = 14.01 g/mol + 3.03 g/mol
Molar mass of ammonia = 17.04 g/mol
3. Now that we have the molar mass of ammonia, we can calculate the mass of the sample using the given number of moles of hydrogen atoms.
- Since there are three hydrogen atoms in each molecule of ammonia (NH3), the mole ratio of hydrogen atoms to ammonia is 3:1. This means that for every 3 moles of hydrogen atoms, there is 1 mole of ammonia.
Number of moles of ammonia = 0.750 moles of hydrogen atoms * (1 mole of ammonia / 3 moles of hydrogen atoms)
4. Calculate the moles of ammonia.
Number of moles of ammonia = 0.750 moles of hydrogen atoms * (1 mole of ammonia / 3 moles of hydrogen atoms)
Number of moles of ammonia = 0.250 mol
5. Finally, calculate the mass of the sample using the moles of ammonia and the molar mass of ammonia.
Mass of the sample = Number of moles of ammonia * Molar mass of ammonia
Mass of the sample = 0.250 mol * 17.04 g/mol
Mass of the sample = 4.26 g
Therefore, the mass of the sample of ammonia that contains 0.750 moles of hydrogen atoms is 4.26 grams.