February 20, 2017

Homework Help: Chemistry

Posted by Nina on Wednesday, May 30, 2012 at 6:44pm.

Test corrections :) They're calculations/short answers. I'd just like something to compare answers to or help me get the full answer (all partial credits). Thanks!

#9. When water is electrolyzed it produces hydrogen and oxygen. If 10.0% of 150.0g of water is electrolyzed, wht is the final volume of gas if the temperature is 17.2 degrees C and the pressure is 98.9kPa?

#11. Caffeine has 49.48% carbon, 5.15% hydrogen, 28.87% nitrogen and 16.49% oxygen. Its molar mass is 194.2g/mol. Its molecular formula is?

#14. The compound X2O is 63.7% X (mystery element). What is the identity of X?

#15. Carbon disulfide burns in oxygen. Complete combustion gives the reaction CS2 + 3O2 -> CO2 + 2SO2. [16.352 L SO2; 8.064 L CO2; Excess CS2] What was the pressure in the container after the reaction if the container is 3.86 L and the temperature was 392K?

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