A pycnometer is a glass flask with a tight fitting glass stopper that can be used to determine the density of an insoluble solid by measuring the volume of water ejected out of the pycnometer when sample of the solid is placed in it. Determine the density in g/cm³ of an unknown metal alloy sample from the following measurements. Assume the density of water is 1.000 g/cm³. Mass of clean pycnometer = 25.151 g Mass of clean pycnometer plus water = 42.481 g Mass of clean pycnometer plus metal sample = 40.305 g Mass of clean pycnometer plus metal plus water = 54.265 g (after ejected water is dried from the outside surface)

Large amounts of titanium metal are refined by reacting titanium(III) chloride solution with magnesium metal. To test this refining process, a student reacts 1.55 kg of magnesium metal with excess titanium(III) chloride solution. After the reaction was complete, the student had extracted 1.62 kg of titanium metal. From this data, calculate the percent error of this experiment. Hint: Write a balanced chemical reaction equation and calculate theoretical mass first. Do not show your work in the space provided. Record only your final answer with the correct number of significant digits and the proper units. Answer: Evaluate your calculated percent error. Is this an acceptable percent error?

(2.23 x 10^3 g) (9.0 x 10^-3 g)/ 10.1 x 10^-7 s^2=

Suppose 0.816g  of barium nitrate is dissolved in  100.mL  of a  42.0mM  aqueous solution of sodium chromate.   Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the barium nitrate is dissolved in it. Be sure your answer has the correct number of significant digits.

A salt solution was evaporated on a hot plate. The dish holding the solution had a mass of 238.7564 g. After drying the salt solution, the dish then weighed 241.5823. What is the mass of the dried salt?

How many mL of liquid mercury with a density of 13.6g/mL must you dispense to have 1.56 x 10-3 mol

A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 8.200 g • She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 45.74 g- • She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 24.09 ml. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. ml

The gasoline tank of an automobile contains 49.0 kg of gasoline. The gasoline combines with 196 kg of oxygen. What is the total combined mass of the carbon dioxide and water produced by combustion in the engine?

Convert the following measurement. kg 4 5.4 x 10 g mol · L mol · dL

How many liters of 0.250 M NaOH solution can be prepared from 10.0 g of NaOH? Place your answer in the box. Express your answer using only a number without text. Report your result in decimal notation and to the proper number of significant figures. All numbers are measured.