8. What is the mass of the substance shown in each scenario, recorded properly? (a) (b) (c) 0.00 12.50 25.199 26.09 9 2.55 14.55 mass of the substance = g mass of the substance = g mass of the substance = g

(a) H₂O2 molecular mass conversion factor (b) C6H12 molecular mass conversion factor (c) SO₂Cl2 molecular mass conversion factor U u u 1

a Assume that mitochondria are cylinders 8.00 um in length and 0.800 pm in diameter. What is the volume of a single mitochondrion? The volume of a cylinder is given by the expression: V = n x y2 x h Volume= m

2. For, 4 CuzN (s) + 3 02 (g) → 6 Cu20 (s) + 2 N2 (g) (a) Find the mass of Cu,0 formed by using 6.0 grams of copper (1) nitride, Cu;N. Given amount Answer Work (by dimensional analysis) and units with units (b) Find the mass of Cu,0 formed by using 1.0 g of oxygen, 0,. Given amount Answer Work (by dimensional analysis) and units with units (c) Which reactant is the limiting reactant? (Cu3N or 02)

A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of water is produced by the reaction of 5.48g of oxygen gas?   Round to 3 significant digits.

(a) What is the volume (in km³) of Avogadro's number of sand grains if each grain is a cube and has sides that are 1.6 mm long? 2470000 ✔ km³ (b) How many kilometers of beaches in length would this cover if the beach averages 123 m in width and 12.1 m in depth? Neglect air spaces between grains. 1840 km

Carbon 14 dating The technique of carbon 14 (4C) dating is used to determine the age of archaeological and geologi- cal specimens. The formula T = -8310 In x is sometimes used to predict the age T (in years) of a bone fossil, where x is the percentage (expressed as a decimal) of 14C still pres- ent in the fossil. (a) Estimate the age of a bone fossil that contains 4% of the 14C found in an equal amount of carbon in present- day bone. (b) Approximate the percentage of "C present in a fossil that is 10,000 years old.

Be sure to answer all parts. Urea, chemical formula (NH,)½CO, is used for fertilizer and many other things. Calculate the number of N, C, O, and H atoms in 1.68 x 10* g of urea. Enter your answers in scientific notation. (a) Nitrogen, N x 10 atoms (b) Carbon, x 10 atoms (c) Oxygen, x 10 atoms (d) Hydrogen, H x 10 atoms

You are given 8.16 g of an unknown mixture of ethane gas and oxygen gas. You burn the unknown mixture in a sealed container and recover 0.788 g of water and also recover some carbon dioxide and ethane gas. (v) What was the mass of oxygen gas in the unknown mixture? (w) What was the mass of ethane gas in the unknown mixture? (x) What was the mass percent of oxygen gas in the unknown mixture?

1892889099 BN=9781305657571&snapshotld%32199... Lo DTAP Q Search this cour Use the References to access important values if needed for this question. Automobiles are often implicated as contributors to global warming because they are a source of the greenhouse gas CO2. How many pounds of CO, would your car release in a year if it was driven 100. miles per week? Gasoline is a complex mixture of hydrocarbons. In your calculations, assume that gasoline is isooctane (molecular formula C3H18) and that it is burned completely to CO2 and H,O in the engine of your car. Also assume that the car averages 25.6 miles per gallon and that the density of isooctane is 0.692 g cm Pounds of CO2 released = lbs Submit Answer 5 question attempts remaining