1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Crazy boy [7]
3 years ago
7

How much heat is given off when 8 g of hydrogen reacts in: 2H₂ + O₂ → 2H₂O; ΔH = -115.60 kcal

Chemistry
1 answer:
Sedbober [7]3 years ago
4 0
ΔΗ= -115.6 kJ/mol
H2 has a Mr of 2, so as mol=mass/mr we can work out that there are 4 moles of H reacting

Therefore we multiply -115.6 by 4 = -462.4
You might be interested in
Should the United States continue to develop/use nuclear power? Why or why not?
Vlad [161]

Answer:

Yes

Explanation:

because they should

5 0
3 years ago
Ñspent fuelî that can no longer be used to create energy.<br> nuclear waste ?
svetoff [14.1K]
Spent fuel that can no longer be used to create energy is waste. 
6 0
3 years ago
What is the volume of 8.7 * 10 ^ 23 molecules of chlorine gas (Cl 2 ) ?
Mariana [72]

Answer:

32.3 dm³

Explanation:

Data given:

no. of molecules of Cl₂ = 8.7 x 10²³

Volume of chlorine gas (Cl₂) = ?

Solution:

First we have to find number of moles

For this formula used

    no. of moles = no. of molecules / Avogadros number

    no. of moles = 8.7 x 10²³ / 6.022 x 10²³

    no. of moles = 1.44 moles

Now we have to find volume of the gas

for this formula used

                      no. of moles = volume of gas / molar volume

molar volume = 22.4 dm³/mol

Put values in above equation

                 1.44 moles = volume of Cl₂ gas / 22.4 dm³/mol

rearrange the above equation

                 volume of Cl₂ gas = 1.44 moles x 22.4 dm³/mol

                volume of Cl₂ gas =  32.3 dm³

8 0
3 years ago
No tengo pregunta jajaja
masha68 [24]

Answer:

--

------Explanation:

8 0
3 years ago
Read 2 more answers
A student titrates a 10.00mL sample of an HCl solution, using 0.359 M solution of NaOH. She finds that 24.75mL of sodium hydroxi
salantis [7]
HCl and NaOH react in a 1:1 ratio, meaning that 1 H+ from HCl will react with 1 OH- from NaOH. Knowing this, and that molarity is mol/liter, all we need to do is use what we have available. First we must find the mols of HCl in our solution, so we set up the following equation in the following steps:
1. 24.75mL x (0.359mol NaOH / 1000mL) = 8.885 x 10^-3mol NaOH
   This is done in order to find the mols of NaOH to convert to mols of HCl.
2. 8.885x10^-3mol NaOH x (1 mol HCl/1mol NaOH) = 8.885 x 10^-3mol HCl
   Here we just used the mols of NaOH we found to convert to mols of HCl using the 1:1 ratio described earlier.

From the mols of HCl all we have to do is divide by the amount of liters in the solution. Since we started with 10mL HCl and added 24.75mL NaOH, the total volume is 34.75mL = 0.03475L. So:
8.885 x 10^-3mol HCl/0.03475L = 2.557 x 10^-1M HCl
However, this is the molarity of the HCl and NaOH solution, not the original HCl solution. Using the dilution equation M1V1=M2V2, we can solve for the original molarity.
M1 = the molarity of our HCl in the titrated mixture (2.557 x 10^-1M HCl)
V1 = the total volume that our mixture has (34.75mL = 0.03475L)
M2 = what we're trying to find
V2 = the amount of the original HCl that we had (10mL = 0.010L)
Simply solving for M2 gives us:
M2 = (M1V1) / V2 or:
M2=((2.557 x 10^-1) x 0.03475L) / 0.010L = 8.89 x 10^-1M HCl. That is your answer.
6 0
3 years ago
Other questions:
  • In the wave mechanical model of the atom orbitals are regions of the most probable location of
    12·1 answer
  • How do you know if a reaction is exothermic? Enter your answer in the space provided
    9·1 answer
  • Using the average initial pH of your acetic acid solutions (2.96), and the average molarity of those solutions(.0602), calculate
    14·1 answer
  • One mole of nitrogen dioxide has 6.02 x 10²³ nitrogen dioxide molecules. If nitrogen dioxide is made of one nitrogen atom and tw
    15·2 answers
  • Nonmetal halogen family atmoic mass 35
    6·1 answer
  • If there is 15.00 grams of magnesium in the reaction what quantity of sodium will be produced
    9·1 answer
  • Why is excess magnesium oxide used in the formation of magnesium sulfate crystals?<br>​
    13·2 answers
  • What will be the substitution product of (S)-2-chloro-3-methylbutane in polar aprotic conditions favoring SN2?
    11·1 answer
  • PLEASE HELP
    5·1 answer
  • 3. A lab technician is preparing urea broth. It should be sterilized by filtration, he autoclaves it instead, just like he does
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!