160g of aluminum is burned in excess air to produce aluminum oxide, Al2O3(s). When the reaction is complete, 260g of solid aluminum oxide has been produced.
Write a balanced equation for the reaction. (1 mark)
Calculate the theoretical yield. (2 marks)
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Calculate the percentage yield. (2 marks)

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.