Chemistry Answers

An LPG tank contains 11.0 kg of butane gas, (C4H10), in a 25.0 L gas tank. What must be the pressure of the gas inside the tank when the temperature is 25 DEGREES CELCIUS?

What would be the pressure of 1.5 moles of Oxygen gas in a vessel with a volume of 5.0 L and temperature of 24 DEGREES CELCIUS?

 The fermentation of glucose produces ethanol and carbon dioxide as follows: C6H12O6 --> 2C2H5OH + 2 CO2. How many grams of ethanol will be produced when 4 grams of glucose reacts in this fashion? (The molar mass of glucose is 180 g/mol while ethanol is 46 g/mol). 

 Mustard gas is a poisonous gas that was used in World War 1 and banned afterward. It causes general destruction of body tissues, resulting in the formation of large water blisters. The chemical formula for mustard gas is C4H8Cl2S. What is the molecular mass of mustard gas?

The precipitate was filtered, washed free of precipitating agent, dried, and weighed, and 0.4114 g was recovered. Calculate the percentage of Hg₂Cl₂ in the sample.

Your lab partner accidentally mixed some sodium chloride with your sample of Epsom salts (MgSO₄･7H₂O). You want to make a standard solution of magnesium ion, and this is the only sample of a magnesium salt you have. To determine the amount of magnesium salt in the mixture, you heat 100.00 g to drive off the water of hydration and find that the anhydrous mixture has a mass of 65.75 g. What is the mass in grams of the original salt mixture that you must add to 1.000 L of water to make a 0.1000 M solution of Mg²⁺ ion?

Find the total enthalpy for rection   

 2C (g) +   3H₂ (g)         C₂H₆ (g)

                Given the thermochemical equations.

           2C(g) + 2 O₂ (g)                   2CO₂ (g)                 ∆H = -786 kJ/mol

           3H₂ (g) +  O₂ (g)            3H₂O (l)                           ∆H = -858 kJ/mol

2CO₂ (g) + 3H₂O (l)           C₂H₆ (g) +  O₂ (g)            ∆H = +1560 kJ/mol  

How many moles of ammonia are in .4L of a 3.0 M aqueous ammonia solution? If this solution is diluted to 1.0 L, what will be the molarity of the new solution?

chemical equation for benzoic acid +copper sulfate+ silicate and precipitate formed

Chalcopyrite (CuFeS2) is a principal mineral of copper. Calculate the number of

kilograms of Cu in 3.71 X 103kg of chalcopyrite.