Chapter 1, Problem 1.71E

How to properly use significant figures in this case?Ccal = (-ΔHrxn x nLR)/ΔTCcal = (-55.85 kJ/mol x 0.00100 mol)/5.3°CCcal = ?????? It would help if you can clarify the rules for multiplication and division. Thanks!

The composition of a mixture of potassium chlorate and potassium chloride is to be determined. A 9.94 gram sample of the mixture is heated until the creation of oxygen gas stops. If the sample mass after heating is 7.54 grams, what is the percent by mass of potassium chlorate in the mixture? Report your answer with 3 significant figures.

Three blocks of the same shape and size are placed in front of you. Block A has a mass of 3.0 g, block B is 5.0 g, and block C is 10.0 g. Which has the higher density?

thickness of aluminum foil mass of aluminium foil 0.405 g length of aluminum foil 9.5 cm width of aluminum foil 9.6 cm what is the volume of aluminum foil? what is the thickness of aluminum foil? show calculations.

Isn't 10.3 Liters only? Because when following the fewest sigfig in the equation, it should be in 3 significant figures and not 4 (10.33)? Thank you so much

Answer the following questions regarding this chemical reaction: Cu(s) + HNO3(aq) --> Cu(NO3)2(aq) + H2O(l) + NO2(g) c. If you want to produce 100.0 g of Cu(NO3)2, how much volume of HNO3 is needed? Density of HNO3 is 1.51 g/cm3. Give your answer in mL. Use the correct number of significant figures.

A chemist must dilute 78.3 mL of 9.91 mM aqueous calcium sulfate (CaSO4) solution until the concentration falls to 3.00 mM. She'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits. ÚL x10 ?

Bob and Jill are measuring the height of Mr. Chenet (Mr Chenet is 1.8593 meters tall). Bob gets a measurement of 1.6329, while Jill gets a measurement of 1.8. This means that Bob is more accurate, while Jill is more precise.  True or False?

A sample of gold alloy has a mass of 9.3 kg. It is determined that 0.6 kg of the alloy is actually made up of copper and zinc, with the remainder being gold. Calculate the percentage of this gold in the alloy? Express your answer to the nearest percentage (nearest ones place). Hint: calculate the mass in grams of the gold in the alloy, divide by the whole mass of the alloy, and multiply by 100%. Round your answer to two significant figures. (I had to alter the wording of this question since it wasn't calculating significant figures properly, so if you got it wrong because of significant figures you can assume you probably actually got it correct.)