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What is the theoretical yield of Fe2O3 (molar mass: 159.7 g/mol) when 60.0 g of Fe (molar mass: 55.85 g/mol) reacts with excess amount of O2? 4 Fe (s)  +  3 O2 (g)  –> 2 Fe2O3 (s)

What is the oxidation number of sulfur (S) atom in the following compound, Na2S2O3?

Which of the following will change the value of an equilibrium constant? A. changing temperature B. adding other substances that do not react with any of the species involved in the equilibrium C. varying the initial concentration of reactants D. varying the initial concentration of products E. changing the volume of the reaction vessel  

A 210-g ball falls from a window that is 6.0 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?

A net force of 285 N is applied to a certain object. As a result, the object accelerates with anacceleration of 3.44 m/s2. The mass of the object is

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.7 s, what is the height of the bridge?

A 777 aircraft has a mass of 375,000 kg. At a certain instant during its landing, its speed is 33.0 m/s.If the braking force is 421,000 N, how much further does it travel along the runway before it comesto a stop?

James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 2.5 m/s. Compare the time it takes each to reach the lake below.

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan’s back, causing Susan to start moving away from Bill. Just after Bill stops pushing,

What is the sum of three measurement quantities 3.2, 2.28, and 1.173 written with the correct number of significant figures?