L
lulu01
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I have three problems from my homework I do not understand.. Can anyone please help! Thank you so much!
1.) Solid carbon dioxide (CO2 (solid)), called 'dry ice', is useful in maintaining frozen foods because it vaporizes to CO2 (gas) rather than melting to a liquid. How many kg of dry ice can be produced from 5.00 x 10^3 L CO2 (gas) measured at STP?
2. Pyruvic acid, HC3H3O3, is involved in cell metabolism. It's amount can be determined by using a yeast enzyme. The enzyme makes that following reaction to go to completion: HC3H3O3 (aq) [arrow] C2H4O (aq) + CO2 (gas). If a sample containing pyruvic acid gives 25.6 mL of carbon dioxide gas, CO2, at 398 mm Hg and 35 degrees Celsius, how many grams of pyruvic acid are there in the sample?
3.Diacetyl, a substance contributing to the characteristic flavor and aroma of butter, consists of 55.80% C, 7.03% H, and 37.17% O. In the gaseous state at 100 degrees Celsius and 747 mmHg, a 0.3060-g sample occupies volume of 111 mL.
a. What is the molecular weight of diacetyl?
b. What is the molecular formula of this compound?
c. What is it's empirical formula?
1.) Solid carbon dioxide (CO2 (solid)), called 'dry ice', is useful in maintaining frozen foods because it vaporizes to CO2 (gas) rather than melting to a liquid. How many kg of dry ice can be produced from 5.00 x 10^3 L CO2 (gas) measured at STP?
2. Pyruvic acid, HC3H3O3, is involved in cell metabolism. It's amount can be determined by using a yeast enzyme. The enzyme makes that following reaction to go to completion: HC3H3O3 (aq) [arrow] C2H4O (aq) + CO2 (gas). If a sample containing pyruvic acid gives 25.6 mL of carbon dioxide gas, CO2, at 398 mm Hg and 35 degrees Celsius, how many grams of pyruvic acid are there in the sample?
3.Diacetyl, a substance contributing to the characteristic flavor and aroma of butter, consists of 55.80% C, 7.03% H, and 37.17% O. In the gaseous state at 100 degrees Celsius and 747 mmHg, a 0.3060-g sample occupies volume of 111 mL.
a. What is the molecular weight of diacetyl?
b. What is the molecular formula of this compound?
c. What is it's empirical formula?