The volume of steam that could be produced at STP if 12.8 g of oxygen reacts with excess hydrogen is 17.92 L
How to determine the volumeWe'll begin by obtaining the mole of steam produced. This can be obtained as follow:
Mass of O₂ = 12.8 gMolar mass of O₂ = 2 × 16 = 32 g/molMole of O₂ = 12.8 / 32 = 0.4 mole2H₂ + O₂ -> 2H₂O
From the balanced equation above,
1 mole O₂ reacted to produce 2 moles of steam, H₂O
Therefore,
0.4 mole O₂ will react to produce = 0.4 × 2 = 0.8 mole of steam, H₂O
Finally, we shall determin the volume as follow:
At standard temperature and pressure (STP),
1 mole of H₂O = 22.4 L
Therefore,
0.8 moles of H₂O = (0.8 mole × 22.4 L) / 1 mole
0.8 moles of H₂O = 17.92 L
Thus, we can conclude that the volume produced is 17.92 L
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to what volume in ml should you dilute 100ml of a 2.50 m CaCl2 solucion to obtain 0.75 M CaCl2 solution
GIVEN :
• Volume ,(V1)= 100ml
• Concentration ,(C1) = 2.50 M
• Concentration ,(C2) = 0.75 M
• Volume ,(V2) = ?
The relationship between Volume and Concentration can be represented by formula :
[tex]C_{1\text{ }}V_1=C_2V_2[/tex]Replacing the given parameters into the formula above , Final Volume (V2) will be :
[tex]\begin{gathered} C_1V_1=C_2V_2 \\ \therefore V_{2\text{ }}=\text{ }\frac{C_1\cdot V_1}{C_2} \\ \text{ =}\frac{2.50\text{ M }\cdot100\text{ ml}}{0.75\text{ M }} \\ \text{ = }333.33\text{ ml} \end{gathered}[/tex]This means thea final volume = 333.33mlWhich of the following is most likely pseudoscience?
A. A scientific journal explains the procedure of an experiment to determine the density of Earth’s layers by detecting changes in the speed of waves passing through them.
B. A doctor recommends an antibiotic to cure an infection.
C. A salesman describes how sickness is caused when your body’s energy is not flowing properly and his wristbands help balance your energies.
D. The Environmental Protection Agency publishes weekly updates on the radiation levels at various beaches and warns vacationers not to sunbathe without using sunscreen.
The correct option that is most likely pseudoscience is C. A salesman describes how sickness is caused when your body’s energy is not flowing properly and his wristbands help balance your energies.
What is pseudoscience?Pseudoscience is that practice in which it is presented as if it were scientific but is not compatible with the scientific method since it uses vague and contradictory statements. They are going to be based more on beliefs that are usually of mystical origin, they are occultists. They are not governed either by general laws but are more particular cases.
These practices are usually unreliable as they are not substantiated by any official scientific status.
Therefore, we can confirm that the correct option that is most likely pseudoscience is C. A salesman describes how sickness is caused when your body’s energy is not flowing properly and his wristbands help balance your energies.
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Look at the image and answer the required information (if necessary, you can investigate). g. Phase of matter at room temperature (solid, liquid, gas) h. Ionization Energy and electronegativity i. Group and period on periodic table j. Common compounds the element forms k. Human uses of the element l. Where it can be found in the world m. Any other special properties (if necessary, you can investigate)
G) Since the boiling point of Fluorine is -188°C, at room temperature Fluorine will be a gas
H) Ionization energy and electronegativy are related to the ability to form ions, they can be measured in values, for Ionization energy, fluorine has a value of 17.42, which is a high value, and for electronegativity is 3.98, one of the highests
I) Fluorine is in the group 7A, also known as halogens, and in the second period
J) Some popular compound that will have Fluorine in its composition will be: CaF2 (Calcium fluoride), HF (Hydrogen fluoride) and NaF (Sodium fluoride)
K) Fluorine can protect us from dental decay, this is why is widely used in toothpastes
L) Fluorine will be mostly found in minerals, rocks, coal and clay
M) Fluorine is the most reactive and most electronegative element of the whole periodic table
Explain how copper is produced from copper() sulfate solution by electrolysis?
Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.
Predict whether each of the following molecules is polar or nonpolar.
Answer
Polar: IF5, PCl3, IF
Non-polar: XeF6, SiCl4, CSe2
Explanation
XeF6 should be non-polar because its molecular geometry is octahedral.
SiCl4 is a non-polar compound because of its linear and symmetrical shape.
IF5 is polar in nature. The molecule has a bent-shaped geometrical structure because of lone pair and bond pair repulsion as per VSEPR theory due to which there occurs an imbalance in charge distribution across the molecule.
PCl3 is a polar molecule because of its tetrahedral geometrical shape having a lone pair on the Phosphorus atom and the difference between the electronegativity of Chlorine(3.16) and Phosphorus(2.19) atoms resulting in unequal sharing of electrons and developing positive and negative poles across the molecule making it a polar molecule.
IF is a polar covalent molecule. Fluorine is more electronegative than iodine due to which dipole moment is generated that makes the IF a polar molecule.
CSe2 is non-polar molecule. This is because the molecular geometry of CSe2 is linear with symmetric charge distribution on the central atom.
How many kJ of energy can be released by a banana containing 150 calories?
Step 1
1 calorie or cal = 4.184 J
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Step 2
Procedure:
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150 cal x (4.184 J/1 cal) = 627.6 J
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Step 3
1 kJ = 1000 J
---------------------
Step 4
627.6 J x (1 kJ/1000 J) = 0.6276 kJ
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Answer: according to all options
None of these
A sample of gas at 240K and 670 mmHg occupies a 1.28L volume. What volume (in Liters) will the gas occupy at 198K if the pressure is changed to 680 mmHg?
Answer:
1.04 L.
Explanation:
What is given?
Temperature 1 (T1) = 240 K.
Pressure 1 (P1) = 670 mmHg.
Volume 1 (V1) = 1.28 L.
Temperature 2 (T2) = 198 K.
Pressure 2 (P2) = 680 mmHg.
What do we need? Volume 2 (V2).
Step-by-step solution:
To solve this problem, we have to use the combined gas law. The combined gas law expresses the relationship between the pressure, volume, and absolute temperature of a fixed amount of gas. For a combined gas law problem, only the amount of gas is held constant. The formula of combined gas law is:
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}.[/tex]We need to find the volume 2 (V2), so let's solve for this unknown value and let's replace the given data that we have:
[tex]\begin{gathered} V_2=\frac{P_1V_1T_2}{T_1P_2}, \\ V_2=\frac{670\text{ mmHg}\cdot1.28\text{ L}\cdot198K}{240K\cdot680\text{ }mmHg}, \\ V_2=1.04\text{ L.} \end{gathered}[/tex]The final volume for this case would be 1.04 L, the volume is being reduced.