Chemistry Answers

A container of 500.00 g of Br 2 was reacted with 87.93 g of carbon. What is the limiting reactant? What mass of product was expected to form? If 352.77 g of CBr4 actually formed, what is the percent yield?

C +    Br2 —>     CBr4

How many molecules are there in 0.08 mole of urea?

Draw the resonance structures of cyanate ion. Out of them which one is less important 

as a resonance structure and why?

Calculate the mass of carbon in 10.00 g of glucose (C6H1206). Show the step by step process.

How many grams of Iron are produced when 25.0g Fe2O3 reacts with Aluminum? Show your complete solution including the balanced chemical equation.

How many mL of 0.250 M HCI would react exactly with 30.0 mL of the 0.150 M solution of Ca(OH)2 solution? The chemical reaction involved is:

HC1(aq) + NaOH(aq) → NaCl(aq) + H2O (1)

Are the values of Kf and Kb dependent on the identify of the solvent, the solute, or both? Explain

The process of decomposition of an electrolyte by passing electric current through its solution is called as

12.755 g of a metal initially at 99.0 c are placed into 75.0g of water initially at 23 c the final temperature of the water is 24.5 c calculate the specific heat of the metal the specific heat of water is 4.184 J/g c

Suppose that you are travelling in the Space Shuttle Endeavor on a journey to Mars. The atmosphere (of the vehicle) consists of 20% oxygen and 80% helium by volume. It was noticed before take off from the Kennedy Space Center that there is a small leakage which if unchecked, would lead to a continual loss of gas at a rate of 0.05 atm/day through effusion. If the temperature in the space shuttle is maintained at 22°C and the volume of the vehicle is 15,000 liters. Calculate the amounts of helium and oxygen in grams that must be stored on a 5-day journey to allow for the leakage.