Solution 1
Answer : The pressure of the gas is, 8.42 atm
Explanation :
Using ideal gas equation,
where,
P = pressure of the gas = ?
V = volume of the gas = 748 ml = 0.748 L
conversion used : (1 L = 1000 ml)
T = temperature of the gas =
n = number of moles of the gas = 0.255 mole
R = gas constant = 0.0821 L.atm/mole.K
Now put all the given values in the ideal gas equation, we get the pressure of the gas.
Therefore, the pressure of the gas is, 8.42 atm
Solution 2
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After doing β- decay, the formed daughter nucleus has the same number of mass number as the parent atom but the atomic number has increased by 1 and neutron number has reduced by 1.
If Na²⁶₁₁ (number of neutrons = 26 - 11 = 15) undergoes a β- decay, then produced daughter atom must have 12 protons and 14 neutrons. Hence, the daughter atom should be Mg.
Na²⁶₁₁ → Mg²⁶₁₂ + ₋₁⁰β + energy
The balanced nuclear equation for beta decay of sodium-26 is represented as Na²⁶₁₁ → Mg²⁶₁₂ + β₋₁⁰ + energy.
What is beta decay?
Beta decay is one of the type of radioactive nuclear decay reaction in which emission of a beta particle takes place from the atomic nuclear.
Beta particle define by the symbol β₋₁⁰ i.e. this particles has no mass but having a negative charge on it. In this reaction atomic mass of the parent atom is equal to the new formed daughter atom. But in this reaction number of neutron is reduced by 1 and number of proton is increased by one of parent atom. So, balanced nuclear equation for β− decay of sodium−26 is represnted as:
Na²⁶₁₁ → Mg²⁶₁₂ + β₋₁⁰ + energy
Hence balanced nuclear equation for the beta decay is represented above.
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Bonding in chemistry is completely and totally due to electrons. Every element wants 8 electrons in its outer shell in order to be stable. This is what we call the “Octet Rule”.
So for 1 mol of potassium contains 0.00012 mol of K-40
Now 1.6 oz of K = 45.36 g of K
average atomic weight of K = 39.1 g
so 45.36 g of K contains:
(45.36 / 39.1) * 0.00012 * 6.022 x 10²³ (atoms of K-40)
= 8.4 x 10¹⁹ atoms of K-40
We know, activity A is:
A = 0.693 / t1/2 N₀
[t1/2 : half life time and N₀ : initial number of atoms]
t1/2 of K-40 = 1.28 x 10⁹ years
= 4.04 x 10¹⁶ seconds
So A = (0.693 / 4.04 x 10¹⁶) * (8.4 x 10¹⁹ ) = 1441 cps
A = 141 x (1/3.7 x 10¹⁰) because 3.7 x 10¹⁰ cps = 1 Ci
A = 3.9 x 10⁻⁸ Ci = 3.9 x 10⁻⁵ millicurie
When additional 5 grams of NaCl are dissolved in solution the conductivity of solution increases as more ions are available for conduction.
What are ions?
An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with the oppositely charged ions resulting in neutral molecules.
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A) The conductivity of the solution will increase because more ions are being added to the solution.
Because number ions will be increased, but big amount of NaCl can be still dissolved.
For light 3 to function, switch D does not have to be on. This diagram shows a parallel circuit that provides more than one way for the current to return to the power source.
Radioisotope can be used to determine the age of fossils, to treat skin disease, to sterilize foodstuffs, and also to sterilize surgical instruments.
Radioisotope dating is a way to estimate a fossil's age by a method of analyzing the elemental isotopes which are within the rocks which it is in.
Answer:
The molecules get closer together and move more slowly.
Explanation:
from a gas to a liquid, the atoms or molecules of the substance do not change. Instead, the motion of the atoms or molecules in the substance determines its state of matter.
gas condenses to form a liquid, the molecules get closer together and move more slowly. If the molecules continue to slow down until they move so slowly that they can only vibrate against one another, then the substance becomes a solid.
It is a warm air mass over a continent describes an air mass with symbol cT.
What is air mass?
An air mass is a sizable portion of the atmosphere that has a largely constant temperature and moisture content. Air masses can travel thousands of kilometers in either direction and can extend up to 16 km (10 mi) into the atmosphere, or the stratosphere.
Large, uniformly-cooled and humid surfaces are known as source zones where air masses form. Low wind speeds allow air to remain still for an extended period of time and absorb the characteristics of the source region, such as heat or cold.
The weather characteristics of this air mass depend on how long of a sea track it takes to travel from Europe to the British Isles. Because this air is naturally very cold and dry, if it travels only a short distance over.
Therefore, It is a warm air mass over a continent describes an air mass with symbol cT.
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Answer:
B) Warm air mass over a continent
Explanation:
cT means Tropical c= continent