Answer:
+375.2 KJ.
Explanation:
The balanced equation for the reaction is given below:
H₂ + F₂ —> 2HF ΔH = +536 KJ
From the balanced equation above,
2 moles of HF required +536 KJ .
Finally, we shall determine the heat required to produce 1.4 mol of hydrogen fluoride, HF. This is illustrated below:
From the balanced equation above,
2 moles of HF required +536 KJ .
Therefore, 1.4 moles of HF will require = (1.4 × 536)/2 = +375.2 KJ
Thus, +375.2 KJ of heat energy is required.
C7H6O2 + O2 → CO2 + H2O
can someone show me step by step how do balance that
Answer:
2C7H6O2 + 15O2 → 14CO2 + 6H2O
Explanation:
C7H6O2 + O2 → CO2 + H2O
Carbon is not balanced (Reactant - 7, Product - 1)
Adding 7 to CO2;
C7H6O2 + O2 → 7 CO2 + H2O
Carbon is now balanced, however hydrogen is not balanced (Reactant - 6, Product - 3)
Adding 3 to H2O;
C7H6O2 + O2 → 7 CO2 + 3 H2O
Hydrogen is now balanced, however oxygen is not balanced (Reactant - 4, Product - 3)
Since 3H2O gives an odd value of O, multiply all through by 2;
2C7H6O2 + 2O2 → 14 CO2 + 6 H2O
Oxygen is still not balanced (Reactant - 8, Product - 34)
Change 2O2 to 15O2;
2C7H6O2 + 15O2 → 14CO2 + 6H2O
Equation is now balanced.
Calculate: A. What is the specific heat of plastic when 440 Joules of heat are radiated on a 140 gram slab of plastic which changes temperature from 20 -22 oC?
Answer:
1.571 J/g°C
Explanation:
Using Q = mc∆T
Where;
Q = amount of heat in Joules
m = mass of substance (grams)
c = specific heat capacity
∆T = change in temperature (°C)
According to the question;
m = 140g, Q = 440J, ∆T = 22°C - 20°C = 2°C
Using Q = mc∆T
c = Q/m∆T
c = 440/ 140 × 2
c = 440/280
c = 1.571 J/g°C
A gas has a solubility of 1.46 g L at 8.00 atm of pressure. What is the pressure of a sample of the same gas that
contains 2.7 g/L of the dissolved gas?
Answer:
[tex]14.8\ \text{atm}[/tex]
Explanation:
[tex]C_1[/tex] = Initial concentration = 1.46 g/L
[tex]C_2[/tex] = Final concentration = 2.7 g/L
[tex]P_1[/tex] = Initial pressure = 8 atm
[tex]P_2[/tex] = Final pressure
From Henry's law we have the relation
[tex]\dfrac{C_2}{C_1}=\dfrac{P_2}{P_1}\\\Rightarrow P_2=\dfrac{C_2}{C_1}P_1\\\Rightarrow P_2=\dfrac{2.7}{1.46}\times 8\\\Rightarrow P_2=14.8\ \text{atm}[/tex]
The pressure of a sample of the same gas at the required concentration is [tex]14.8\ \text{atm}[/tex].
where do the letters go help me plz
Answer:
For d I'm pretty sure its Organ System, I apologies if I am wrong
Jayden says that the dentist can shine a special light on his teeth that will make his teeth become whiter. Can light change Jayden’s teeth?
Answer:
No
Explanation:
This is because light cannot not whiten Jayden's teeth but light can change materials by hearing it up. There are some substances or tooth paste that can be use to whiten the teeth because of the content they are made off which whitens the teeth. Some of it include baking soda, hydrogen peroxide toothpaste, tumeric toothpaste, toothpaste that contain fluoride.
PLEASE HELP WILL GIVE BRAINLIEST AND 100 POINTS
the answer to your question is C
A car is driven for 3 hours. What else do you need to know to describe this car's speed?
the number of passengers in the car. the time of day.
the road the car in driven on.
the distance the car is driven.
Answer: Distance the car has driven
Explanation:
The speed equation is speed=distance/time and since we already know time we need to know distance to solve for speed
Exactly 10.0 L of air -25°C is heated to 100.0°C. What is the new volume if the pressure is kept constant?
Answer: V2= 15.0403226 Liters
Explanation:
Use V1/T1=V2/T2
Make sure you change the degrees Celsius to Kelvin. (Kelvin = degrees Celsius +273)
10.0L / 248 K = V2/ 373 K
Cross multiply V1 and T2 and divide by T1
(10.0 L)( 373K)/ 248 K = V2
V2= 15.0403226 Liters (Kelvin cancels out)
What is the atomic number of the following element??
Answer:
91
Explanation:
Form of energy knows as light energy
pls help need it now as I don't know the answer
Answer:
Iron :)))))))))))))))))))))))))
Answer:
The answer is Copper
Explanation:
what is the cation and anion formula for each compound
Answer:
cation ca2+ anion cl-
Explanation:
please see the picture your answer is there
a container of gas has a pressure of 1.45 atm at a temperature of 52 degrees celsius, if the pressure increases to 4.2 atm what would be the final temperature of the volume is held constant?
Answer:
941 K (668°C)
Explanation:
We have the following data:
Initial pressure : P1 = 1.45 atm
Initial temperature: T1 = 52°C + 273 = 325 K
Final pressure: P2 = 4.2 atm
Final temperature: T2 = ?
The relation between pressure and temperature for a gas at constant volume is given by Gay-Lussac's law:
P1/T1 = P2/T2
That means that the pressure is directly proportional to the absolute temperature (in K). So, we calculate T2 from the equation:
T2 = P2 x T1/P1 = 4.2 atm x (325 K/1.45 atm) = 941 K
Therefore, the final temperature would be 941 K (668°C). This is consistent with the law, that states that if the pressure increase, the temperature will be increased.
Using the heat capacity of water (1 cal/g oC), determine how much energy was released by the combustion of the wax.
Answer:
hello some part of your question is missing below is the missing part
1. Mass of water in the boiler 336.6g 2. Mass of wax burn 0.289g 3. Increased in the temperature 6.6 C
and change to Joules and to kilojoules
answer : 9.295 kJ
Explanation:
Calculate how much energy was released by the combustion of the wax
ΔT = 6.6°C
Note :The energy released by the combustion of wax is absorbed by the water
heat = mass * specific heat capacity * ΔT
= 336.6 * 1 * 6.6 = 221.56 cal
convert; 221.56 cal to J
= 221.56 * 4.184 = 9295.0 J
hence the energy released by the combustion of the wax = 9.295 kJ
Please helppppppppppppppppppp
50 ppoints
Answer:
I can’t see the whole page
Explanation:
What is the meaning of the acceleration value 9.8 m/s?????
Answer:
The value 9.8 m/s^2 is the average acceleration of a falling object due to the force of gravity on Earth. The letter g represents this value the formula v=gt. With this constant and formula, the speed of an object is calculated at the time t in seconds after it is dropped.
All objects fall at the same rate of speed due to gravity, regardless of their weight. If a small grain of sand and a bowling ball are dropped at the same time, both hit the floor at the same time. The value of g varies by one's location on the planet, ranging from 9.782 m/s^2 in the Panama Canal Zone to 9.832 m/s^2 at the Noth Pole
Explanation:
A compound is made of 49.31% C, 43.79% 0 and the rest hydrogen. The molar
mass is 146.1g/mol, what are the empirical and molecular formulas?
(Show work)
Explanation:
49.31 + 43.79 = 93.10
finding the percentage of hydrogen in the compound hence 100-93.10 =6.9
therefore 6.9 percent of hydrogen is present in the compound
assuming that the compound is in 100 g so the elements present would be 49.31g of C , 43.79g of O and 6.9g of H
no. of moles of C = given mass÷molar mass
= 49.31 ÷ 12
=4.11 mol
no of moles of O = givem mass ÷molar mass
=43.79÷ 16
=2.73 mol
no. of moles of H =6.9÷1
=6.9 mol
dividing the no. of moles of each element by the least count of the elemnt to get the ratio of the simple whole numbr
therefore
so by dividing we get 1:1:2 of C:O:H
the empirical formula is CH2O
empirical formula mass of CH2O IS
= (12)+(2×1)+(16)
= 12+2+16
=30 G/MOL
n= molar mass of the compound ÷ empirical formula mass of the compound
so, n= 146.1 ÷30
n=5
molecular formula = n×empirical formula
molecular formula= 5×CH2O
molecular formula=C5H10O5 (ribose is the compound)
(they don't have science so I guess cemastry will do.)
warm air rises because of___
A student holds the back of his hand near an iron tosee if it's hot. The heat transfer is___
Warm water moves throuout a mattress because of___
In a swimmming pool The watter near the surface is warmer because of___
(i'll do the rest later)
warm air rises because of convection.
A student holds the back of his hand near an iron to see if it's hot. The heat transfer is conduction.
Warm water moves throughout a mattress because of ... why is there warm water in a mattress again? Convection, I guess.
In a swimming pool, the water near the surface is warmer because of convection and solar radiation; it's closer to the Sun than the bottom of the pool, so it receives more thermal radiation, making it warmer.
The graph shows temperature anomalies for Earth over the
last 800,000 years. A temperature anomaly is a variation
from the average temperature. A positive temperature
anomaly indicates a temperature that is higher than
average.
-600,000
-800,000
-200,000
-400,000
Year
Which two trends do the data show?
Please help ASAP !!
Answer:multiple periods of warmer, and there are natural cycles or warmer.
Explanation: trust me
Find the pH of a solution containing [H+]=0.00003
Answer:
Acid
Explanation:
because acid has a pH of6_1
A sample of gas has a volume of 215 cm3 at 23.5 °C and 3 atm. What will the volume of the gas be at STP
Answer:
165.3 cm^3
Explanation: hope this is correct!!
P1 * V1 / T1 = P2 * V2 / T2
P1 = 84.6 kPa
V1 = 215 cm³
T1 = 23.5°C = 23.5 + 273 K = 296.5 K
At STP:
P2 = 101.3 kPa
V2 = ?
T2 = 273 K
If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after
the reaction ends?
If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after the reaction ends will always be equal to the reactant or same.
What is balanced reaction?A balanced reaction or chemical reaction is that the amount or mass of the reactant will always be equal to the amount of the product after the reaction is complete.
If A and B are two reactant then their concentration will be equal to the product which is C and D the number of moles taking participate is also equal.
Therefore, a balanced reaction takes place in a sealed container, the mass before the reaction begins compare to the mass after the reaction ends will be equal as reactant or will be the same.
Learn more about balanced reaction, here:
https://brainly.com/question/14263388
#SPJ2
What is the bond angle in carbon dioxide, CO2?
A compound MBr4 has a relative formula mass of 439
What is the relative atomic mass of M (Br=80)
Answer:
119
Explanation:
because the molecular mass of MBr can be found by adding the individual atomic masses of the molecule
Molar mass of M + 4(Molar mass of Br)= Molar mass of
MBr
Molar mass of M +4(80)= 439
Molar mass of M +320 = 439
Molar mass of M = 439 -320
Molar mass of M =119
Uranium has an atomic number of 92. How many neutrons does U-238 have?
Answer:
146 neutrons.
Explanation:
What is enthalpy and how is it different than heat?
Answer:Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system.
Explanation:
Which of the following traits in inherited?
)piano skills
)strong muscles
)sun - bleached hair
)height
Sun-Bleached hair.
You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).
Hope this helps and have a nice day.
-R3TR0 Z3R0
Name the substance added to the furnace to reduce the zinc oxide.
Answer:
Chemical was added in the zinc oxide to the theorems to reduce the zinc oxide.
Explanation:
Lead (II) chromate, PbCrO4, was used as a pigment in paints. How many atoms are in 25 g?
Answer:
4.658 * 10^22 atoms
Explanation:
Mass = 25 g
Number of atoms = ?
Number of moles = Mass / Molar mass
Molar mass of PbCrO4 = 323.1937 g/mol
Number of moles = 25 g / 323.1937 g/mol
Number of moles = 0.077352993 moles
1 mol = 6.022 * 10^23 atoms
0.077352993 mol = x
Solving for x;
x = 0.077352993 * 6.022 * 10^23 / 1
x = 4.658 * 10^22 atoms
What are the components of our solar system?