Final answer:
To weigh out 3.4 moles of ammonia, you would need approximately 57.982 grams.
Step-by-step explanation:
To determine the number of grams of ammonia needed to weigh out 3.4 moles, we need to use the molar mass of ammonia, which is 17.03 g/mol.
Using the equation:
mass = moles x molar mass
we can substitute the given values:
mass = 3.4 moles x 17.03 g/mol
mass = 57.982 g
Therefore, you would need approximately 57.982 grams of ammonia to weigh out 3.4 moles.