Chemistry Answers

How many moles of Fe will be produced from 6 moles of H₂ in this reaction? 

Fe₃O₄ + 4H₂ → 3Fe + 4H₂O  

How many moles of CO

CO are produced when 1.3 moles

moles C

C reacts?

in an experiment 1.90g of NH3 reacts with 4.96g of O2.

4NH3(g) + 5O2(g) —> 4NO(g) + 6H2O(g)

i. Which is the limiting reactant(show your working)

ii. How many grams of excess reactant remain?(show your working)

iii. How many grams of NO is formed? (show your working)

1) Calculate the molarity of a 45.3 g NaNO3 dissolved in water to produce 225 mL of solution.

2) What mass of concentrated HCl is needed to prepare 2.45 L of 13.0 M HCl?

3) What volume can be prepared from 1.0 M NaOH from 2.54 g NaOH?

100g of an unknown substance was determined to be ~84% carbon by mass and ~16% hydrogen by mass (Hint: what unit of measurement do we need?)

Consider the reaction below

I2O5(g) + 5 CO2(g) ———> 5 CO2(g) + I2(g)

80.0g of iodine (v) oxide reacts with 28.0g of carbon monoxide. Determine the mass of iodine I2 which would be produced

5.92(g) of hydrated Feso4 when heated to a constant mass gave 3.24(g) of anhydrous salt. Calculate the number if moles off water crystallization in the hydrated salt (H=1, O=16, S=32, Fe=52)

During an experiment to find the enthalpy change for the reaction between zinc and copper sulfate solution a student recorded the temperature of the copper sulfate solution for two minutes. She then added the zinc and continued to record the temperature whilst stirring the solution in the 'coffee cup' calorimeter. She plotted a graph of her data. What value should she use for ΔT when calculating her result?

20cm3 of ethyl was mixed with 120cm3 of oxygen at room tempreture and at atmospheric pressure and sparkled in an ediometer tube. Calculate the volume of

1. Excess oxygen gas

2. CO2 oxide produced

If 25.0cm3 of methane was burned in 20cm3 of oxygen

I. Write an equation to represent the reaction

II. Which of the gas was in excess

III. Calculate the volume of the excess gas