Answer:440.154j
Explanation:
H=mcΔT
H= 13*4.18*8.1
H=440.154j
Using glucose as an example of food, calculate the annual human production of CO2 in grams, assuming that each person consumes 4.35 × 102 g of glucose per day. The world's population is 6.50 billion and there are 365 days in a year.
Answer:
Therefore the annul human production of =1.514×10¹⁵ gram
Explanation:
A glucose molecule react with oxygen and produce carbon-dioxide and water.
The reaction is
The balance form of the above reaction is
The molar mass of is
={(6×12)+(12×1)+(6×16)}g/mole
=180 g/mole
The molar mass of is
=[{12+(2×16)}] g/mole
=44 g/mole
Then the molar mass of 6 is
=(6×44) g/mole
=264 g/mole
180 gram glucose is produce 264 gram of .
1 gram glucose is produce gram of .
Given that each person consumes 4.32×10² g glucose per day.
Therefore each person produce gram per day
Total population in the world is 6.50 billion= 6.50 ×10⁹
∴ 6.50 ×10⁹ produce gram per day
Therefore the annul human production of
=
=15136.55×10¹¹ gram
=1.514×10¹⁵ gram
What is the molarity of a solution that contains 148g NaOH in 4.00 L solution? a 0.925 M b 0.0253 M c 0.459 M d 1.363 M
Answer:
M = 0,925
Explanation:
n= mass/Molecular Weight
n = 148g / 39,99 (g/mol)
n= 3,7mol
M= n/Volumen(L)
M= 3,7mol/4L
M=0,925
Jaynes science teacher mixed a clear liquid with a blue liquid in a beaker. After a few minutes there was a white solid at the bottom of the beaker. What mostly likely true about white solid
Options:
A.
It is a new substance with different properties.
B.
It was secretly added to the beaker by the teacher.
C.
It is an organic compound.
D.
It will dissolve in water to form a blue solution
Answer:A. It is a new substance with different properties.
Explanation: A chemical reaction is a reaction between two substance or elements which resulted in the formation of another substance or compound with a new and different properties when compared to the initial materials, chemical reaction or change can not be reversed.
THE MIXTURE OF THE CLEAR LIQUID WITH A BLUE LIQUID WHICH LED TO THE FORMATION OF WHITE SOLID BENEATH AT THE BASE OF THE BEAKER IS A CHEMICAL REACTION.
Answer:
It is a new substance with different properties.
Suppose you start with 0.303 g of copper wire and faithfully follow the procedure. At the end you find that the copper dust weighs 0.309 g. Based on your understanding of the experimental procedure, offer at least two rational explanations for this apparent violation of the law of conservation of mass.
In general, violation of conservation of mass could be ascribed to following factors-
(1) Copper might be oxidized to copper oxide through aerial oxidation which has higher molar mass than metallic copper.
(2) Presence of moisture could lead to increase in mass. So proper drying is needed.
(3) As difference in mass arises at third decimal point therefore accurate weighing of sample is required during experiment.
Law of conservation of mass:The mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed.
Thus, given above the points for violation of the law of conservation of mass.
Find more information about Law of conservation of mass here:
brainly.com/question/15289631
Answer:
Hi, the given question has some missing parts as the experimental procedure has not been mentioned.
Explanation:
In general, violation of conservation of mass could be ascribed to following factors-
(1) Copper might be oxidized to copper oxide through aerial oxidation which has higher molar mass than metallic copper.
(2) Presence of moisture could lead to increase in mass. So proper drying is needed.
(3) As difference in mass arises at third decimal point therefore accurate weighing of sample is required during experiment.
Calculate the moles of FeFe in 1.17×10221.17×1022atoms of FeFe. Express the number of moles numericall
Answer:
The number of moles of Fe in 1.17*10^22 atoms Fe is 0.0194 moles
Explanation:
Step 1: Data given
Number of atoms of Fe = 1.17 * 10^22 atoms
Number of Avogadro = 6.022 *10^23
Step 2: Calculate number of moles Fe
Moles Fe = atoms Fe / number of Avogadro
Moles Fe = 1.17*10^22 atoms / 6.022*10^23 / moles
Moles Fe = 0.0194 moles
The number of moles of Fe in 1.17*10^22 atoms Fe is 0.0194 moles
Calculate the number of SO2SO2 molecules in 5.83 molmol of SO2SO2. Express the number of molecules numerically.
Answer:
The number of molecules in 5.83 moles of SO2 is 3.51*10^24 molecules
Explanation:
Step 1: Data given
Number of moles SO2 = 5.83 moles
Number of Avogadro = 6.022 * 10^23
Step 2: Calculate molecules SO2
Number of molecules = number of moles * number of Avogadro
Number of molecules = 5.83 * 6.022 *10^23 / moles
Number of molecules = 3.51*10^24 molecules
The number of molecules in 5.83 moles of SO2 is 3.51*10^24 molecules
Calculate the number of CC atoms in 0.183 molmol of CC. Express the number of atoms of carbon numerically.
Answer:
In 0.183 moles C we have 1.1*10^23 atoms C
Explanation:
Step 1: Data given
Number of moles C = 0. 183 moles
Number of Avogadro = 6.022 *10^23 / moles
Step 2: Calculate the number of atoms
The number of atoms = moles * number of Avogadro
The number of atoms = 0.183 moles * 6.022*10^23 /moles
The numberof atoms = 1.1*10^23 atoms
In 0.183 moles C we have 1.1*10^23 atoms C
Which of the following statements is true of water in a solid state? Choose all that apply. A. There are covalent bonds between each water molecule.
B. Solid water conforms to the shape of its container.
C. Water molecules in ice do not interact with each other very often.
D. It is rigid and forms a three-dimensional crystalline shape.
E. Water molecules in ice remain in a relatively fixed position and are not as mobile as they are in the liquid state, where there are fewer hydrogen bonds.
A reaction occurs in a mixture of 2 liters of hydrogen gas and 3 liters of chlorine gas. How many liters of hydrochloric gas are produced? Which is the excess and by how much?
Answer:
We will produce 4.0 L of hydrochloric gas
Chlorine gas is the excess. There will remain 1.0 L
Explanation:
Step 1: Data given
Volume o H2 = 2.0 L
Volume of Cl2 = 3.0 L
Step 2: The balanced equation
H2 + Cl2 → 2HCl
Step 3: Calculate moles
22.4 = 1 mol
2.0L H2 = 0.0893 moles H2
3.0 L Cl2 = 0.134 moles Cl2
Step 4: Calculate limiting reactant
For 1 mol H2 we need 2 moles Cl2 to produce 2 moles HCl
H2 has the smallest amount of moles so it's the limiting reactant.
It will completely be consumed (0.0893 moles)
Cl2 is in excess. There reacts 0.0893 moles
There will remain 0.134 - 0.0893 = 0.0447 moles
This is 0.0447 * 22.4 = 1.0 L
Step 5: Calculate moles HCl
For 1 mol H2 we need 2 moles Cl2 to produce 2 moles HCl
For 0.0893 moles H2 we'll have 2*0.0893 = 0.1786 moles HCl
Step 6: Calculate volume HCl
1 mol = 22.4 L
0.1786 moles = 4 L
We will produce 4.0 L of hydrochloric gas
Chlorine gas is the excess. There will remain 1.0 L
Isotopes of an element have the same number of ________ and different numbers of ________. A. electrons... protons
B. protons... electrons
C. protons... neutrons
D. neutrons... protons
Answer: C
Explanation:
Isotopes has the same atomic number which is the same as number of proton but different mass number.
Mass number = proton + neutron A change in the number of neutrons affect the mass number
A carbon dioxide laser is an infrared laser. A CO2 laser with a cavity length of 53.00 cm oscillates in the m = 100,000 mode. What is the wavelength of the laser beam?
Answer:
5.3 × 10^-4 m or 0.0000053m
Explanation:
Wavelength is given by 2L/m
Where m is the waves bewtween the cavity mirrors which is 100000
L is the cavity length which is 53.00 cm
53/100 (convert to meter) =0.53m
Therefore the wavelength is (2 × 0.53m)/100,000
=0.0000053
= 5.3 × 10^-6 m
When calcium oxide, CaO(s) dissolves in water, the water becomes hot. Write a chemical equation for this process and indicate whether it is exothermic or endothermic.
Answer:
The interaction reaction of calcium oxide and water leads to the formation of calcium hydroxide, this reaction is exothermic, which indicates that energy is released.
CaO(s) + H2O ⇒ Ca(OH)2
Explanation:
Calcium oxide reacts violently with water, causing it to reach 90 C. It then forms calcium hydroxide, also called slaked lime. It is heated because it releases energy in the form of heat, because the new substance formed (slaked lime) has less internal energy than the original and this is released in the form of heat. As a general rule, acid and base solutions are exothermic.
Jack is playing with a Newton's cradle. As he lifts one ball to position A and drops it, it impacts the other balls at position B and becomes stationary while the ball on the opposite side leaps into the air swinging to position C. What is happening to cause this?
Answer:
Newton's Cradle is a neat way to demonstrate the principle of the CONSERVATION OF MOMENTUM.
What happens here is when the ball on one end of the cradle is swung and it hits the other balls that are motionless, or stationary, the momentum of the swinging ball is transferred to the next ball upon impact.
Momentum is not lost in this action, what happens when it hits the next ball, the momentum is transferred to the next one, and then the next, and the the next, till it reaches the last ball on the other end. Since nothing is next to the last ball, it pushes the ball upwards, which will swing down and repeat the process going the other way.
This also demonstrates the CONSERVATION OF ENERGY. As you will see, the energy continues to move through the other balls, passing it from one ball to the other, which keeps this constantly moving.
Answer:
D) Energy of the first ball is transferred on impact to the opposite ball.
Suppose 5.00 moles of Lithium Nitrate react with 5.00 moles of Magnesium Fluoride react according to **BALANCE 1st!!**: __Li(NO3) __ MgF2 -> __LiF __Mg(NO3)2
Answer : The balanced chemical reaction will be,
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
The unbalanced chemical reaction is,
This reaction is an unbalanced chemical reaction because in this reaction number atoms are not balanced.
In order to balance the chemical equation, the coefficient '2' put before the and then we get the balanced chemical equation.
The balanced chemical reaction will be,
H2S(aq)⇌HS−(aq)+H+(aq), K1 = 9.06×10−8, and HS−(aq)⇌S2−(aq)+H+(aq), K2 = 1.18×10−19, what is the equilibrium constant Kfinal for the following reaction? S2−(aq)+2H+(aq)⇌H2S(aq)
Answer:
Therefore the equilibrium constant is 9.35× 10²⁵
Explanation:
Equilibrium constant:
Equilibrium constant is used to find out the ratio of the concentration of the product to that of reactant.
xA+yB→zC
The equilibrium constant K,
Here [A] is equilibrium concentration of A
[B] is equilibrium concentration of B
[C] is equilibrium concentration of C.
1.
2.
3.
Therefore,
⇒K₃=9.35× 10²⁵
Therefore the equilibrium constant is 9.35× 10²⁵
Under constant temperature, the volume occupied by a gas varies inversely to the pressure applied. If the gas occupies a volume of 24 cubic inches under a pressure of 5 pounds per square inch, find the volume when the gas is subjected to a pressure of 10 pounds per square inch.
Answer:
not sure, but you know what?
Explanation:
you are amazing! keep doing what youre doing!
In a typical mammal neuron, the membrane potential must surpass ________ to produce an action potential. At this point, what happens to the sodium activation gate
Answer:
Voltage threshold
Explanation:
The action potential threshold or voltage threshold is the minimum voltage that the membrane must reach to cause the mass opening of voltage-dependent sodium channels, that is, to trigger an action potential.
The frequency of action potentials, on the other hand, depends on the intensity of the original stimulus.
Only stimuli significant enough to exceed the threshold are transmitted as information and encoded in the form of action potentials along the axon to other neurons.
Alka‑Seltzer is marketed as a remedy for stomach problems, such as heartburn or indigestion, and pain relief. It contains aspirin, sodium bicarbonate, and citric acid, and is effervescent when placed in water. Enter the equation for the reaction of one sodium bicarbonate ( NaHCO3 ) molecule with one citric acid ( C 6 H 8 O 7 ) molecule. Do not include phases.
Answer:
The equation for the reaction of one sodium bicarbonate ( NaHCO3 ) molecule with one citric acid (C6H8O7) molecule is the following:
Sodium Bicarbonate + Citric Acid ⇒ Water + Carbon Dioxide + Sodium Citrate
NaHCO3 + C6H8O7 ⇒ 3 CO2 + 3 H2O + Na3C6H5O7
Explanation:
The reaction is in balance, that is, the whole H2CO3 is not finished, but a little bit of this acid is left in the solution. Therefore, when sodium bicarbonate is added to the solution with citric acid, sodium citrate salt (C6H5O7Na3) and carbonic acid (H2CO3) are formed, which is rapidly broken down into water (H2O) and carbonic oxide (CO2).
C6H8O7 + NaHCO3 ⇒ C6H5O7Na3 + 3 H2CO3
C6H5O7Na3 + 3 H2CO3 ⇔ C6H5O7Na3 + 3 H2O + 3 CO2
The reactions of the calvin cycle are not directly dependent on light
Explanation:
In the Calvin cycle, the following reactions occur:
A chemist has two large containers of sulfuric acid solution, with different concentrations of acid in each container. Blending 310 mL of the first solution and 590 mL of the second gives a mixture that is 11.58% acid, whereas blending 85 mL of the first mixed with 490 mL of the second gives a 7.25% acid mixture. What are the concentrations of sulfuric acid in the original containers?
Answer:
0.015% and 0.012%
Explanation:
using simultaneous equation