Question

In: Physics

Suppose you have 2.0mol of O2 gas. How many coulombs of positive charge are contained in...

Suppose you have 2.0mol of O2 gas.

How many coulombs of positive charge are contained in this gas in the atomic nuclei?

Express your answer using two significant figures

Solutions

Expert Solution

you're right in noting that the net charge of the gas is zero: however, this is because it contains equal amounts of positive nuclear charge and negative electron charge, and not because no charges are present.

Just treating the positive nuclear charges as their own entity, we need to know that:

(1) Oxygen has atomic number 8, and so each oxygen atom contains eight protons. Consequently, the O2 molecule contains sixteen protons.

(2) Each proton carries a charge of 1.602 x 10^(-19) C (see "elementary charge").

(3) One mole of O2 gas contain's 6.022 x 10^(23) (Avogadro's number) molecules of O2.

Hence, the total positive charge of two mol O2 can be computed by:

(2.0 mol O2) * (6.022 x 10^(23) molecules/mol) * (16 protons/molecule) * (1.602 x 10^(-19) C/proton)
= 3.1 x 10^6 C [1]

Of course, the total negative charge of the gas is equal to 3.1 x 10^6 C as well, and consequently the gas is neutral as a whole.


Related Solutions

In a mass spectrometer, a positive ion with charge q=1.602x10-19 coulombs is accelerated by a potential...
In a mass spectrometer, a positive ion with charge q=1.602x10-19 coulombs is accelerated by a potential difference of 1000 volts (Ec=-V). Once out of the influence of the electric field, a uniform magnetic field of B=0.01 weber/m2 deviates it into a circular trajectory of 182m radius. Determine a) the velocity of the ion b) the mass of the ion in kg and in units of atomic mass.
You have been recording how many miles you get per tank of gas, and you have...
You have been recording how many miles you get per tank of gas, and you have found a mean of 297 and a standard deviation of 23. Use this information to answer the following question. What is the probability you will get 300 miles out of a tank of gas?
You have a cation that has an equilibrium potential with a positive charge. Where is that...
You have a cation that has an equilibrium potential with a positive charge. Where is that ion more highly concentrated (Intracellular or extracellular)? How do you know? If an anion has a higher concentration outside the cell, what will be the charge of its equilibrium potential? Explain your answer.
How do you prove that: (a) holes really exist, (b) holes have a positive charge, (c)...
How do you prove that: (a) holes really exist, (b) holes have a positive charge, (c) Holes have an effective mass?
(i)How much negative charge and how much positive charge are there on the electrons and the...
(i)How much negative charge and how much positive charge are there on the electrons and the protons in a cup of water (0.25 kg)? Note Avogadro’s number is NA = 6.022 × 1023, and each oxygen atom has 8 electrons. (ii) What is the magnitude of the attractive force exerted by the electrons in a cup of water on the protons in a second cup of water at a distance of 10 m?
Part A: How many coulombs are required to plate a layer of chromium metal 0.24 mm...
Part A: How many coulombs are required to plate a layer of chromium metal 0.24 mm thick on an auto bumper with a total area of 0.29 m2 from a solution containing CrO2−4? The density of chromium metal is 7.20 g/cm3. Express your answer using two significant figures. Q = ______ C Part B: What current flow is required for this electroplating if the bumper is to be plated in 16.8 s ? Express your answer using two significant figures.
Suppose that 132 moles of a monatomic ideal gas is initially contained in a piston with...
Suppose that 132 moles of a monatomic ideal gas is initially contained in a piston with a volume of 0.94 m3at a temperature of 348 K. The piston is connected to a hot reservoir with a temperature of 1064 K and a cold reservoir with a temperature of 348 K. The gas undergoes a quasi-static Stirling cycle with the following steps: The temperature of the gas is increased to 1064 K while maintaining a constant volume. The volume of the...
How many grams of product form when 17.8 g of O2 reacts completely? (Assume you have...
How many grams of product form when 17.8 g of O2 reacts completely? (Assume you have enough Cr) Chromium solid reacts with oxygen gas to form chromium (III) oxide How many moles of Cr(s) is needed for 17.8 g of oxygen gas to react completely
1.How many coulombs are required to produce 47.9 g of cobalt metal from a solution of...
1.How many coulombs are required to produce 47.9 g of cobalt metal from a solution of aqueous cobalt (III)chloride Use scientific (E) notation with 2 numbers after the decimal point. 2.How many grams of chromium may be formed by the passage of 95,469 C through an electrolytic cell that contains an aqueous Cr(IV) salt. 3.What product(s) forms at the anode in the electrolysis of an aqueous solution of SnSO4?
1. How do you confirm the presence of O2 gas in an experiment? 2. NH4Cl +...
1. How do you confirm the presence of O2 gas in an experiment? 2. NH4Cl + what base gives NH3. Balance the equation 3. What test detects Na+ ion present in a compound 4. CO2 is colorless and odorless like O2 and H2. 5. How do you confirm the presence CO2 in a reaction ? 6. How could you detect the presence of Cl- ion? 7. How could you detect the presence of SO4 ion? 8. What are the reactions...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT