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A mixture of unknown salts containing a sulfate salt has been weighed to be 1.50 g. After dissolving the solution in 500 mL of water, heating it, and adding hot barium chloride (40.0 mL, 0.500 M); the precipitate has been collected after succeeding digestion, and the mass was found to be 0.325 g. What is the percentage (by mass) of sulfur in the mixture?
Calculate the mole fraction of a solution containing 2.6 grams of sodium sulfate in 20 grams of water
If a chemist titrates 450.0 mL of HBr with a 2.5 M solution of NaOH and requires only 2.2 mL of the base to reach the end point, what is the concentration of the hydrogen bromide?
A chemist reacts 45.0 mL of 3.4 M AgNO3 with an excess of Na2CrO4. How many grams of silver chromate will be produced?
If a chemist has a stock solution of BF3 that is 8.5 M and would like to make 325 mL of 2.0 M BF3, how would she do it?
an unknown substance with a mass of 100 grams absorbs 1000 J while undergoing a temperature increase of 15 C. What is the specific heat of the substance
1.Calculate the pH of a base buffer solution composed of 0.20 M NH3 and 0.15 M NH4Cl after the addition of 0.10 M HCl. The Kb of NH3 at 25oC is 1.80 × 10-5.
2.What is the pOH of a buffer solution that is 0.150 M chloroacetic acid and 0.250 M sodium chloroacetate, after the addition of 0.100 M HNO3? The value of Ka for chloroacetic acid is 1.3 x 10-3.
In a certain reaction, 1.5g of ammonia was given and 2.75g of oxygen, how much NO is produced? (in mass and mole)
4NH3 + 502 --> 4NO + 6H20
When a research balloon is released at sea level, where the temperature is 14.8°C
14.8°C and the atmospheric pressure is 1.01×10
5
Pa
1.01×105 Pa, the helium in it has a volume of 12.9 m
3
12.9 m3. The balloon reaches an altitude of 32 km
32 km, where the temperature is −44.1°C
−44.1°C and the pressure is 867 Pa
867 Pa. What is the volume of the helium at this altitude?
boyles law includes which variables
