This problem is providing the masses of both NaHCO3 and HCl and the initial and final temperature due to the reaction. It asks for the balanced chemical equation, the direction and quantity of heat and the consumed moles.
Calorimetry in chemical reactions.In chemistry, calorimetry in chemical reactions basically allows us to quantify the chemical heat that is involved in a chemical change due to the rearrangement of bonds when the reactants get in contact.
In such a way, one can start this problem by writing and balancing the undergoing chemical equation between NaHCO3 and HCl, according to the law of conservation of mass:
[tex]NaHCO_3 + HCl\rightarrow NaCl+H_2O+CO_2[/tex]
Which is already balanced as equal number of sodium, hydrogen, carbon and oxygen are present on both sides of the equation.
Next, since the final temperature of the resulting solution was lower than the initial temperature, one comes to the conclusion that the reaction is endothermic, as the energy was released by the solution and absorbed by the reaction.
Thereafter, given the general equation for the calculation of heat:
[tex]Q=mC\Delta T\\\\[/tex]
One can calculate the heat involved in the reaction, assuming the specific heat of the solution equals waters:
[tex]Q=-(2.58g+49.00g)*4.184\frac{J}{g\°C}(17.4-21.4)\°C \\\\Q=-863J*\frac{1kJ}{1000J}=0.863 kJ[/tex]
Which adopts the negative sign at the beginning, because of the flow of heat which make the heat of reaction the negative of that of the solution.
Finally, we use some stoichiometry to calculate the number of moles of sodium bicarbonate and hydrochloric acid used in the reaction:
[tex]2.58gNaHCO_3 *\frac{1molNaHCO_3}{84.0gNaHCO_3}=0.0478molNaHCO_3\\ \\49.00gHCl*\frac{1molHCl}{36.46gHCl}=1.344molHCl[/tex]
Hence, since they react in a 1:1 mole ratio, we can see the excess HCl in the reaction, and thereby, the correct number of moles, reacting in the chemical reaction are just 0.0478 mol of the both of them.
Summary of answers:a. [tex]NaHCO_3 + HCl\rightarrow NaCl+H_2O+CO_2[/tex]
b. The reaction is endothermic, as the energy was released by the solution and absorbed by the reaction
c. 0.863 kJ
d. 0.0478 mol
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HELP!! ASAP! GIVING 10 POINTS AND BRAINLIEST!!
What is one reason why transpiration is important in plants?
Question 17 options:
It produces food from the sugar in the plant cells.
It enables the flow of water out of the plant.
It produces carbon dioxide in the leaves of the plant.
Answer:
The Answer Is B.
Explanation:
Give Brainliest.
I have a crush but I don't know how to tell him that I like him what do I do?
Answer:
grab life by the balls and tell him. what harm will it do? you only live once
Answer:
start hanging out with him more
Explanation:
then gradually start giving hints or just ask him striaght up
solve this questions please
Answer:
C. through concentrated sulphuric acid and then over heated copper
The molar mass of bismuth (\ce{Bi}BiB, i) is \pu{208.98 g/mol}208.98 g/mol208, point, 98, space, g, slash, m, o, l.
Calculate the mass in grams of a sample of \ce{Bi}BiB, i containing \pu{7.35x10^23}7.35×10
23
7, point, 35, times, 10, start superscript, 23, end superscript atoms.
1. What are some things that gray wolves eat?
A. large and small animals
B. trees and plants
C. fruits and insects
D. humans and their pets
Answer:
A, and C are foods that wolves eat.
Explanation: Hope this helps
What mass of silver can be produced from 3.00 g of copper and 3.85 g of silver nitrate?
Answer:
Explanation:
Balanced Chemical Equation:
Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag
Step 1: Find Limiting Reagent
Moles of Cu:
Mole = 3 g / 63.55 g/mol = 0.04721 mol
Moles of AgNO₃:
Moles = 3.85 g / 169.87 g/mol = 0.022664 mol
Also, Mole ratio of Cu : AgNO₃ is 1 : 2. Hence, 0.04721 mol of Cu will require 0.09442 mol of AgNO₃. This means, AgNO₃ is the limiting reagent.
Step 2: Calculate moles of Ag:
0.022664 mol of AgNO₃ will produce 0.022664 mol of Ag because both have same ratio in balanced chemical equation.
Step 3: Calculate mass of Ag:
Mass = 0.022664 mol × 107.87 g/mol = 2.4447 g
If 4.644.64 mol of NO2NO2 occupy 25.925.9 L, how many liters will 2.732.73 mol of NO2NO2 occupy at the same temperature and pressure
Answer:
I will assume that the moles are all mistyped and will change them to:
4.64, 25.9, and 2.73.
15.2 liters
Explanation:
Both situations can be described using the ideal gas law:
PV=nRT,
where P, V, and T are the pressure, volume, and temperature (in degrees K). n is the number of moles. R is the gas constant.
First NO2 : P1(25.9L) = (4.64moles)RT
Second NO2: P2V2 = (2.73moles)RT2
Divide one equation by the other:
(P1(25.9L) = (4.64)RT1)
P2V2 = (2.73)RT2
The temperatures, pressures, and gas constants are unchanged, so we can cancel those to obtain:
(25.9L)/V2 = (4.64/2.73)
V2 = (25.9L)(2.73/4.64)
V2 = 15.2 Liters
Help!! Hurry!! I will mark brainliest if you get it correct. NO SPAM!!!!!!
Write the alpha decay equation for the following isotope:
211/84 PO
Answer:
216/84 Po + 4/2 He a
Explanation:
Answer:
Problem: Polonium-210, 210Po, decays to lead-206, 206Pb, by alpha emission according to the equation 21084Po → 20682Pb + 42He
Explanation:
Determine the number of moles of air present in 1. 35 L at 750 torr and 17. 0°C. Ideal Gas Law formula: PV = nRT(R = 62. 396 L•torr/mol•K) Which equation should you use? P equals StartFraction n R T over V EndFraction. N equals StartFraction R T over P V EndFraction. N equals StartFraction P V over R T EndFraction.
Answer:
Answer: PV/RT = n = N equals startfraction P V over R T endfraction Explanation:
Dominique goes to the doctor for bone aches. The doctor tells him
that Vitamin D helps his body take in the Calcium for his bones.
Explain why the doctor tells Dominique to do more outdoor activities.
Answer:
sun gives you vitamin D
Explanation:
Our body creates vitamin D from direct sunlight on our skin when we're outdoors.
The substances produced i. A chemical reaction are called?
Answer:
it’s called a product
Explanation:
think of the different chemicals as a math problem you add two or more things together and you get the product
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
How many molecules of sodium nitrate are produced when 40 g of sodium azide, NaN3, react with oxygen?
a
3.7x10^23
b
9.2x10^22
c
1.85x10^23
d
6.02x10^23
The time for one cycle of a periodic process is called the:.
Answer:
Period
Explanation:
I believe your answer should be period.
I hope it helps! Sorry if it didn’t… Have a great day!
Layla~
A dead fish has washed up on the beach and is starting to decay. Which compound produces the unpleasant odor from the decaying fish?
A. pentane-1,5-diamine
B. hexane-1,5-diamine
C. hexane-1,6-dithiol
D. 2-pentanone
Answer:
A. Pentane- 1,5-diamine
Explanation:
I just did this in chemistry today
Answer:
The other person is correct.
Explanation:
You should give him brainiest.
Help me please i am so confused Find The Masses
Aluminum
Copper
Iron
Lead
A force of 129,000 N is accelerating a car at 84 m/s/s
what’s the mass of the car?
please help 500 J of work are done on a box when it is pulled horizontally across a frictionless floor by a force of 50 N. How far did the box slide?
A. 15 m
B. 1 m
C. 10 m
D. 100 m
Answer:
C: 10m
Explanation:
Work Done = Force x Distance
500 = 50 x Distance
To get to 500 multiply 50 by 10!
So, the box slid 10m.
Hope this helps and have a good day! ;D
How many milliseconds (ms) are there in 3. 5 seconds (s)? 35 ms 350 ms 3,500 ms 35,000 ms.
Measurement units are the defined units used for the particular dimensions and proportions. 3500 milliseconds are there in seconds.
What is the unit of time?Time is defined as the rate of things occurring or taking place and is given by seconds, minutes, hours etc.
Using the conversion factor the relation between the seconds and milliseconds is:
1 second = 1000 miliseconds
Convert 3.5 seconds into milliseconds using conversion factor:
[tex]\begin{aligned}3.5 \;\rm seconds &= 3.5 \times 1000 \\\\&= 3500 \;\rm miliseconds\end{aligned}[/tex]
Therefore, option C. 3500 milliseconds is correct.
Learn more about time and second here:
https://brainly.com/question/2025518
Answer:
3500 ms
Explanation:
10.
What are the products of a neutralization reaction?
an acid and a base
a salt and water
a salt and an acid
water and a base
Answer:
Salt and water
Explanation:
The reaction of an acid and a base forming a salt and water.
(PLEASE HELP WILL MARK BRAINLIEST!!) A scientist wants to develop a new chemical. In one or two sentences, create a science question and a non-science question that the
scientist could consider when developing the new chemical.
Answer:
Science Question: What will the combination of the resources I use to make this new chemical do to different living organisms and non-living organisms around an environment?
Non-Science Question: What should we call this new chemical?
Explanation:
I hope this helps! If you don't like these questions I've got a few more that may work to your liking! :)
A gas at a pressure of 608 mmHg is held in a container with a volume of 545 mL. What is
the volume at standard pressure?
Answer:
441.81 mL
Explanation:
P1 x V1 = P2 x V2
V2 = P1 x V1 / P2
V2 = 608 x 545 / 750
V2 = 331360 / 750
V2 = 441.81 mL
MARK AS BRAINLIEST.
Another question. What is an example of a chemical change?
Answer:
Yellowing of leaves
Explanation:
Involves the colour change in leaves whereby less amount of chlorophyll is produced
Answer:
burning, cooking, milk becoming curd, rusting of iron
On a summer day early in the moming, a balloon is filled with helium when the temperature
is 21°C, but the temperature will reach a peak of 46°C later in the day. The balloon holds 12.8 L of helium gas at a starting pressure of 239 kPa. The balloon will burst when the internal pressure (Pb) reaches 256 kPa. Answer the following questions and show your
work
1. How many moles of helium gas are in the balloon?
2. What will the gas pressure be in the balloon at the peak temperature?
3. Will the balloons burst when the temperature reaches 42 degrees Celsius? Explain.
4. To what pressure should the helium gas pressure be reduced to avoid bursting the balloon? (Assume no significant volume change of the balloon)
Any help I’d great! Equations are not my strong suit
Based on the data provided;
number of moles of helium gas is 1.25 molespressure at peak temperature is 259.3 kPainternal pressure is above 256 kPa, therefore, the balloon will burst.pressure should be reduced to a value less than 256 kPa by reducing the temperatureWhat is the ideal has equation?The ideal gas equation relatesthe pressure, volume, moles and temperature of a gas.
The moles of helium gas is calculated using the Ideal gas equation:
PV = nRTn is the number of moles of gas
R is molar gas constant = 8.314 L⋅kPa/Kmol
P is pressure = 239 kPa
T is temperature = 21°C = 294 K
V is volume = 12.8 L
Therefore;
n = PV/RT
n = 239 × 12.8 / 8.314 × 294
n = 1.25 moles
The number of moles of helium gas is 1.25 moles
At peak temperature, T = 46°C = 319 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 319/294
P2 = 259.3 kPa
The pressure at peak temperature is 259.3 kPa
At 42°C, T = 315 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 315/294
P2 = 256.07 kPa
Since the internal pressure is above 256 kPa, the balloon will burst.
The pressure should be reduced to a value less than 256 kPa by reducing the temperature.
Learn more about gas ideal gas equation at: https://brainly.com/question/12873752
Will a piece of fruit left in the open air rot sooner in summer or in winter?
Will it make a difference if we swap the anode and cathode in electroplating?
Answer:
▪ Will it make a difference if we swap the anode and cathode in electroplating?
➢ If we interchange the two terminals after electroplating then the ions deposited on the plate will move again towards their original position.
[tex]TextFromYourMrEx...[/tex]
#CarryOnLearning
Explanation:
if we change the two terminals after electroplatingthen the ions deposited on the plate will move again towards their original position...
6) The average atomic mass of boron, B, is 10.811 amu. The natural abundance of 10B is 19.7% and it’s exact mass is 10.012 amu. Calculate the exact mass of the second isotope of boron.
Hope you could understand.
If you have any query, feel free to ask.
Does Jarren love Maria more or does Jarren love Maria more??
Help please (not for school though)
How does mixing hydrogen peroxide and water test the reactivity of catalase?.
Hydrogen peroxide is not the chemical causing the reaction.
Chemical ReactionGenerally,Catalyses is an enzyme which breaks H2O2 into H2O and O2. there will be no reaction if we combine H2O with H2O2,
H2O2 receives dissolved in water except displaying any reaction. So they are used as bad manipulate in the test.
Therefore, it shows that hydrogen peroxide is not the chemical causing the reaction
For more information on Chemical Reaction
https://brainly.com/question/11231920
If a driver takes 30 min to get to the town market, which is 1.5 km away from his house, what is his average speed?
Note: Unit for average speed is km/h
Answer: 0.83 m/s
Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
How to convert formula equations into word equations
Answer:
I don't know what is the answer of it