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General Chemistry
If the voltage of Zn-H+
cell is
0.542 V at 25 0 C, What is the
concentration of the [H+
]?
when : [Zn 2+] = 0.01 M and [H2
] =
1.0 M
cell is
0.542 V at 25 0 C, What is the
concentration of the [H+
]?
when : [Zn 2+] = 0.01 M and [H2
] =
1.0 M
General Chemistry
Consider the following reactions:
3 Ni 2+
(aq) + 2Cr(OH)3 (s) + 10 OH –
(aq) 3 Ni (s) + 2 CrO4
2 (aq) + 8 H2O (l)
A) What is the value for n for this reactions?
B) Calculate the standard free-energy.
C) How long does it take a current of 5 A to deposit 95 g of nickel?
3 Ni 2+
(aq) + 2Cr(OH)3 (s) + 10 OH –
(aq) 3 Ni (s) + 2 CrO4
2 (aq) + 8 H2O (l)
A) What is the value for n for this reactions?
B) Calculate the standard free-energy.
C) How long does it take a current of 5 A to deposit 95 g of nickel?
General Chemistry
Write the cell notation, half reactions and overall reactions of a Galvanic
cell diagram that consists of one half-cell with a silver bar in a 5 x 10 - 2 M
silver nitrate solution (AgNO3
) and another half-cell with a copper bar in a
3.5 x 10 – 4 M copper (II) nitrate solution, Cu(NO3
)2
and a potassium
nitrate,KNO3 use as a salt bridge solution. Measurements indicate that the
copper electrode is negative in relative to the silver electrode. Calculate the
following:
A) Gibbs Free – Energy
B) Standard Gibbs Free – Energy
C) Electrode potential of the cell.
cell diagram that consists of one half-cell with a silver bar in a 5 x 10 - 2 M
silver nitrate solution (AgNO3
) and another half-cell with a copper bar in a
3.5 x 10 – 4 M copper (II) nitrate solution, Cu(NO3
)2
and a potassium
nitrate,KNO3 use as a salt bridge solution. Measurements indicate that the
copper electrode is negative in relative to the silver electrode. Calculate the
following:
A) Gibbs Free – Energy
B) Standard Gibbs Free – Energy
C) Electrode potential of the cell.
General Chemistry
A liquid has a specific gravity of 0.50. What is its density in g/cm3? What is its
specific volume in cm3
/g? What is its density in lbm/ft3? What is the mass of 3.0
cm3
of this liquid? What volume is occupied by 18 g?
General Chemistry
Sodium oxide which is formed when 6.9 g of sodium react with oxygen 2Na + O 2 Na 2 O
General Chemistry
Lead is a poisonous metal that especially affects children because they retain a larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00g of child’s blood would 0.250ppm represent. Take a picture and upload your solution. (Accepts Image files only. Upload 1 file only) *
General Chemistry
Determine the molecular formula of butane given the molecular mass of 58.12 g/mol and empirical formula of C2H5.
General Chemistry
Calculate the number of grams of oxygen that would react with 0.125 g Fes
General Chemistry
how many moles of HNO3 will be produced from the reaction of 63.5g of NO2 with excess water in the following chemical reaction 3NO2 + H2O -> 2HNO3 + NO
General Chemistry
Write the balanced chemical equations of each reaction:
a. Calcium carbide (CaC2) reacts with water to form calcium hydroxide (Ca(OH)2) and acetylene gas (C2H2).
b. When potassium chlorate (KClO3) is heated, it decomposes to form KCl and oxygen gas (O2).
c. C6H6 combusts in air. Hint
