A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. what is the pressure at 273 K
Answers
Answer: The pressure at 273 K is 130 kPa.
Solution:- From Gay-Lussac's law, "At constant volume, the pressure of a given mass of a gas is directly proportional to the kelvin temperature."
The equation used for this is written as:
Where, is the pressure at
temperature and
is the pressure at
temperature.
Temperatures are already given in kelvin so no need to do the conversion. Let's plug in the values and calculate the new pressure.
On rearranging this for new pressure:
340/ 713 = p2/ 273
p2 = 340 x 273/ 713 = 130 kPa
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The radius of an atom of gold (Au) is about 1.35 Å.How many gold atoms would have to be lined up to span 9.5 mm ?
(1) 154.3 g (3) 171.3 g
(2) 155.3 g (4) 308.6 g
Answers
The molar mass of barium hydroxide is 171.3 g/mol (option 3).
What is molar mass?
Molar mass is the mass of a given substance divided by its amount, measured in moles. It is commonly expressed in grams per mole.
The molar mass of a compound can be calculated by summing up the atomic masses of the constituent elements. According to this question, barium hydroxide was given. The molarmass can be calculated as follows:
Ba(OH)₂ = 137.33 + (16 + 1)2
= 137.33 + 34
= 171.3g/mol (option 3).
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Answer (3)
hope this helps!
(2) reduction (4) nuclear fusion
Answers
Answer:
Nuclear Fusion
Explanation:
In nuclear fusion two lighter nuclei combine together in order to form one heavier nucleus.
For example, the energy generated from the Sun is made by nuclear fusion: Two hydrogen (H, atomic number 1) nuclei combine in order to form one helium (He, atomic number 2) nucleus.
Nuclear fission is the opposite reaction, in which one heavier nucleus splits into two lighter nuclei.
Answers
Simply put, a system is an organized collection of parts (or subsystems) that are highly integrated to accomplish an overall goal. The system has various inputs, which go through certain processes to produce certain outputs, which together, accomplish the overall desired goal for the system. A system is a collection of elements or components that are organized for a common purpose. The word sometimes describes the organization or plan itself (and is similar in meaning to method, as in "I have my own little system") and sometimes describes the parts in the system (as in "computer system"). A system is a group of interacting or interrelated entities that form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and expressed in its functioning. Systems are the subjects of study of systems theory. The term "system" comes from the Latin word systēma, in turn from Greek σύστημα systēma: "whole concept made of several parts or members, system", literary "composition".
beryllium (Be) and calcium (Ca)
chlorine (Cl) and helium (He)
oxygen (O) and carbon (C)
Answers
Answers
M = 0.61 M
After that to get the atm we do it like this:
Π = (0.61 M)(0.08206 atm-L/mol-K)(25 + 273 K)
Π = 14.9 atm
and then we do this multyplication
(14.9 atm)(101.3 kPa/atm) = 1509.37 kPa
7.0
8.0
10.0
Answers
Answer: 2.0 (acidic solution)
Explanation: When a salt is formed by the reaction of strong acid and a weak base , it will be acidic in nature and thereby its pH will be less than 7.
In the process, conjugate acid will be formed which will react with water to give the hydronium ion (H_{_{3}}O ^{+})
Thus as the positive ion species is increasing, it will make the solution acidic in nature.
The pH value of a salt that is formed by the reaction of a strong acid and a weak base is: 2.0 (acidic solution)
Meaning of pH Value
pH value is a value on the pH scale that tells us how acidic or basic a solution can be.
When a salt is formed by the reaction of strong acid and a weak base , it will be acidic in nature and thereby its pH will be less than 7.
In conclusion, The pH value of a salt that is formed by the reaction of a strong acid and a weak base is: 2.0 (acidic solution)
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