Chemistry help please ?

Thank you so much !!! 

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1 Answer

  • 1 month ago
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    What your answers are will depend on what you have been taught is the molar volume of a gas at STP (which depends on what you were taught are the standard conditions of temperature and pressure). The "old" standard temperature and pressure were defined as 1 atm pressure and 273.15 K. Under these conditions, one mole of an ideal gas has a volume of 22.414 L/mol. 

    More recently, the standard conditions have been defined as 100 kPa and 273.15 K. By this definition, 1 mole of an ideal gas has a volume of 22.711 L/mol. 

    Unfortunately, the older value is what is still commonly taught, at least in the US. So, I'll use that old value:

    a. 2.50 L X (1 mol / 22.414 L) = 0.112 mol NH3

    b. 0.112 mol NH3 X 17.02 g/mol = 1.90 g NH3

    c. 0.112 mol X 6.022X10^23 molecules/mole = 6.72X10^22 molecules NH3

    d. 6.72X10^23 molecules X (3 H atoms/1 molecule) = 2.02X10^23 H atoms

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