Elements abundant in the body are not abundant on Earth.
a. True
b. False
Answers
Answer:
false is the correct answer,
Explanation:
The most abundant elements present in the body is carbon, oxygen, hydrogen, calcium, nitrogen, and phosphorus.
About 99 percent of the human body is made of ( carbon, hydrogen,oxygen, calcium, nitrogen, and phosphorus.) elements and 0.85 percent is made up of sulfur, sodium, potassium, chlorine, and magnesium and these all elements are abundant on Earth.
Thus the Elements abundant in the body are abundant on Earth.
Most of the body is made up of oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus, all of which are abundant on Earth.
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According to reference table J, which of these metals would react most readily with 1.0 M HCl to produce H2(g)
student has calibrated his/her calorimeter and finds the heat capacity to be 14.2 J/°C. S/he then determines the molar heat capacity of aluminum. The data are: 25.5 g Al at 100.0°C are put into the calorimeter, which contains 99.0 g H2O at 18.6°C. The final temperature comes to 22.7°C. Calculate the heat capacity of Al in J/mol·°C.
Answers
P1V1/T1 = P2V2/T2
Therefore, just substitute in and solve:
(105 kPa)(220.0 mL)/(275K) = ?kPa(95.0 mL)/(310 K)
Solve for ?
Answer is 274. kPa
The new pressure of the sample of helium gas in a cylinder with a movable piston is 274 kPa.
Option 4)274 kPa is the correct answer.
What is Combined gas law?
Combinedgas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
- Initial volume V₁ = 220.0mL = 0.22L
- Initial pressure P₁ = 105kPa = 1.03627atm
- Initial temperature T₁ = 275K
- Final volume V₂ = 95.0mL = 0.095L
- Final temperature T₂ = 310K
- Final pressure P₂ = ?
To calculate the new temperature of the gas, we substitute our given values into the equation above.
P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
P₂ = (P₁V₁T₂) / V₂T₁
P₂ = ( 1.03627atm × 0.22L × 310K ) / ( 0.095L × 275K )
P₂ = 70.673614LatmK / 26.125LK
P₂ = 2.705atm
P₂ = (2.705 × 101.325)kPa
P₂ = 274 kPa
The new pressure of the sample of helium gas in a cylinder with a movable piston is 274 kPa.
Option 4)274 kPa is the correct answer.
Learn more about the combined gaslaw here: brainly.com/question/25944795
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Answers
H+ is equal to 1.104*10^-7
negative log of the H+ conc. or the pH is 6.96 (pH = -log(1.104*10^-7))
The answer is valid and is close to the neutral pH which is 7.
Answers
Answer:
5 pumpkin pies could be made with 7.5 cups of sugar.
Explanation:
The conversion factor to solve the problem is:
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%
Answers
Answer:
B
17.6%
Explanation:
1. Percentage yield = (Actual yield/theoretical yield) x 100
2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.
3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.
4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.
5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams
6. So percentage yield is (60,000/340,000) x 100 = 17.6
B. heat of reaction.
C. heat of combustion.
D. heat content.
Answers
The answer for above statement:
D. heat content.
Explanation:
Enthalpy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure.
Heat content - (thermodynamics) a physical science amount adequate the interior energy of a system and the merchandise of its volume and pressure.
Ans D) heat content
Enthalpy (H) is a thermodynamic state function which according to the first law of thermodynamics is a sum of internal energy (E) and the pressure- volume (PV) work.
i.e. H = E + PV
Thus, enthalpy is the total heat content of a system which includes contributions from both kinetic and potential energy.