3. A student forgot to pre-measure the mass of the second evaporating dish prior to decanting the salt water mixture into it. Can the student weigh another evaporating dish of the same size and use its mass instead?

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?

Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table. Mass of weigh boat 2.762 g Mass of weigh boat and sample 8.802 g What is the mass of the solid sample (in g)?

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids A and B and gas C are elements or compounds? Explain your conclusions for each substance.

A student performs a dehydration experiment and starts with 4.4021 grams of hydrate. After heating the hydrate and allowing it to cool, the student weighs the anhydrous salt. The mass of the resulting anhydrous salt is 2.6271 grams. What is the mass of the water that was lost?

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?

A mixture has three components. The percentage of sand was determined to be 37.31 %, the percentage of benzoic acid was determined to be 37.45 %, and the percentage of salt was determined to be 31.69 %.  Calculate the total percent recovery. Include the % unit and two decimal places in your answer.

A chemist must dilute 42.4 mL of 483. mM aqueous potassium dichromate (K,Cr,O,) solution until the concentration falls to 380. mM . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your answer to 3 significant digits. mL ala

The composition of a mixture of potassium chlorate and potassium chloride is to be determined. A 9.5 gram sample of the mixture is heated until the creation of oxygen gas stops. If the sample mass after heating is 7.44 grams, what is the percent by mass of potassium chlorate in the mixture? Report your answer with 3 significant figures.

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?