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? asked in Science & MathematicsChemistry · 6 years ago

I need some more chem help?

Plz show work and tell me which ur doing

1. How many liters are in 13 moles of acetylene

2. How many grams of methane(CH4) are in 2L tank of methane at STP?

3. how many moles of NaCl are in 3 grams of NaCl

4. The formula for caffeine is C8H10N4O2. How many total atoms are in 0.75 moles of caffeine

1 Answer

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  • Roger the Mole
    Lv 7
    6 years ago

    1. Acetylene is a gas, so to answer correctly it is necessary to know the temperature and pressure at which the measurement is made. Lacking that information, assume STP:

    (13 mol) × (22.414 L/mol) = 291 L

    2.

    (2 L) / (22.414 L/mol) × (16.0425 g CH4/mol) = 1.4 g CH4

    3.

    (3 g NaCl) / (58.4430 g NaCl/mol) = 0.05 mol NaCl

    4.

    8 + 10 + 4 + 2 = 24 atoms/molecule caffeine

    (0.75 mol) × (6.022 × 10^23 molecules/mol) × (24 atoms/molecule) = 1.1 × 10^25 atoms

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