Balancing Reactions
The correct coefficients for the following equation when it is balanced are:
___ AlCl3 + ___ H2SO4 --> ___ Al2(SO4)3 + ___ HCl
2, 3, 1, 6
How many grams of H2O can be produced from 5.0 moles of H2?
90 grams
Which of the following does not have the empirical formula CH4?
a. C6H24
b. C25H100
c. C4H18
d. C7H28
c. C4H18
Balance the following reaction:
Cu + HNO3 --> Cu(NO3)2 + NO + H2O
3Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O
How much nitrogen is required to produce 100kg of ammonia in the following unbalanced reaction? Give your answers in unit of kilograms.
N2 (g) + 3H2 (g) --> 2NH3 (g)
82.3 kg
What is the molecular formula of an unknown molecule with empirical formula of CH2O and experimentally determined molecular mass of 120.056 g/mol?
(120.056 g/mol) / (30.026 g/mol) = 3.99844 = 4
C4H8O4
Using the following unbalanced equation,
NH3 + O2 --> H2O + NO
How many moles of H2O are produced if 2.00 moles of O2 are used?
2.40 mol H2O
A potassium chloride sample weighing about 0.71 g was dissolved in water. Calculate the volume of 2.0 M AgNO3 needed to completely precipitate the chloride ions.
KCl(aq) + AgNO3(aq) -> AgCl(s) + KNO3(aq)
0.71 g / 74.5513 g mol-1 = 0.009524 mol KCl =0.009524 mol AgNO3
0.009524 mol / 2.0 M = 0.004762 L = 4.8 mL
The gravimetric analysis of a compound is 71.1% oxygen, 26.7% carbon and the rest hydrogen. What would be its empirical formula?
C=26.7/12=2.25 H=2.2/1=2.2 O=71.1/16=4.5
CHO2