Combustion analysis of 25.0 g of octane (C8H18) determined that the sample contained 21.03 g of carbon. What is the percent by mass of hydrogen present in octane?

A compound is determined to contain 6.96 g carbon, 0.834 g hydrogen and 2.21 g oxygen. Determine the empirical formula of the compound

How much energy is required to raise the temperature of 40.9 g of cobalt by 38.1oC? The specific heat capacity of cobalt is 0.46 J/g°C.

What distinguishes a process delay from a lot delay in Shingo’s process elements?

How much energy is required to raise the temperature of 40.9 g of zinc by 38.1oC? The specific heat capacity of zinc is 0.388 J/g°C.

Complete the following reaction Ca(NO3)2(aq) + Na3PO4(aq)  →   a) by writing balanced total equation. b) by writing balanced ionic equation. c) by writing balanced net-ionic equation.

Consider the reaction: 2Al(s)  +  6HCl(aq) → 2AlCl3(aq) + 3H2(g) If a sample of 3.0 moles of Al is added to a solution containing 4.0 moles of HCl, how many moles of AlCl3 are formed?

How many significant figures (or digits) are in each of the following number, when rounded to three decimal places? a) 10.03062 g b) 0.01785 cm c) 8.7884 mm How many significant figures (or digits) are in each of the following numbers? d) 9.008 g e) 120 cm f) 0.00010 mm g) 4 cats

What is the significance of rework as a lean metric?

A golden-colored cube is handed to you. The person is saying that it is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm3. You also read that the density of pyrite (a.k.a. fool’s gold) is close to 4.75 g/cm3. You measure the cube and find that it is 1.55 cm on each side, and weighs 71.796 g. a) What is its density in g/cm3? b) What is its density in g/ml? c) Is it gold or pyrite? Show all your work. Use units and correct number of significant figures.