gaseous ammonia is made by the following reaction: N2+3H2 - 2NH3. if you start with 7 liters on nitrogen gas, how many liters of hydrogen are needed for a chemical reaction?

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Technically, only one tiny speck of H2 (one molecule) is need for a reaction. I think what you meant is for a complete reaction to use the 7 g N2.

N2 + 3H2 ==> 2NH3

You can use Avogadro's Law and use volumes (liters) directly.
7 liters N2 x (3 liters H2/1 liter N2) = ?? liters H2.

To determine the number of liters of hydrogen needed for the chemical reaction, we can use the stoichiometric coefficients from the balanced equation. The balanced equation for the reaction N2 + 3H2 -> 2NH3 indicates that for every 1 mole of nitrogen gas (N2) consumed, 3 moles of hydrogen gas (H2) are required to produce 2 moles of ammonia gas (NH3).

Given that you start with 7 liters of nitrogen gas (N2), we need to convert this volume into moles. To do this, we'll need to know the molar volume of nitrogen gas at the given conditions. The molar volume is usually provided in liters per mole at a specific temperature and pressure.

Once we have the moles of nitrogen gas, we can use the stoichiometric ratio to determine the moles of hydrogen gas needed. Finally, we'll convert the moles of hydrogen gas back into liters using the molar volume of hydrogen gas.

Without specific temperature and pressure conditions, I won't be able to provide you with an exact answer. However, I can guide you through the process of calculating the answer once you provide the molar volume of nitrogen gas.