Chemistry Stp

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1.Calculate how many hydrogen atoms are contained in 2.3g of C2H5OH.
2.3 x 1023 Hydrogen Atoms - 2.3g * 1mol/6.06g * 6.02 1023 / 1mol

2.An oxide of sulfur contains 60% by mass of oxygen. Determine the empirical formula of the compound.

3.Ethylene glycol, the substance used in automobile antifreeze, is composed of 38.7 g carbon, 9.7 g hydrogen, and 51.6 g oxygen. a.What is the empirical formula of the compound?

b.If its molar mass is 62.1 g/mol, what is the molecular formula of ethylene glycol?

4.The temp in kelvin of 4.0 L of hydrogen is increased by a factor of 3 and the pressure is increased by a factor of 4. Calculate the final volume of the gas.

5.How many liters of product at 950 mmHg and O°C is produced by the burning of three liters of acetylene (C2H2) at 5 atm and 20°C?

6.What is the mass of 15 liters of chlorine gas at STP?

7.Write the balanced equation for each
a.Nitrogen and oxygen react in cylinders of car engines to form nitrogen monoxide.

b.Nitrogen monoxide is a primary pollutant. After it escapes into the atmosphere, it reacts with oxygen to produce nitrogen dioxide.

c.Nitrogen dioxide is a secondary pollutant which can react further with oxygen and water in the atmosphere to produce nitric acid, one of the component of acid rain.

8.The fizz produced when Alka-Seltzer tablet is dissolved in water is due to the reaction of sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7)
3NaHCO3(aq) + H3C6H5O7(aq) --> 3CO2 + 3H2O + Na3C6H5O7(aq) In a certain experiment, 5.00 g of sodium bicarbonate and 5.00 g of citric acid are allowed to react. a.Which is the limiting reactant? Show solutions to prove your answer.


b.How many grams of carbon dioxide are formed?
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