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chemistry

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A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask.


How many moles of CaCO3 are used?

  • chemistry -

    grams/molar mass = moles. How many moles "were used" I don't know? How many mL did you use of the 250.
    Moles used = moles in flask x (mL used/250) = ??

  • chemistry -

    What mass of natural gas {\rm{(CH}}_4 ) must you burn to emit 271 kJ of heat?

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