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
Pachacha [2.7K]
3 years ago
12

Zn(s) + 2 HCl(aq) —> ZnCl2(aq)

Chemistry
1 answer:
miv72 [106K]3 years ago
4 0

Answer:

First write the balanced equation for the reaction of HCl with Zn (NOTE: the previous answer did NOT do this and thus obtained an incorrect answer)

Zn + 2HCl ==> ZnCl2 + H2(g)

moles of H2 desired:  PV = nRT

n = PV/RT = (1 atm)(10L)/(0.0821 Latm/Kmol)(298K)

n = 0.409 mole H2 desired

moles Zn needed:

0.409 moles H2 x 1 mole Zn/2 moles HCl = 0.204 moles Zn needed

mass Zn needed = 0.204 moles Zn x 65.4 g/mol = 13.4 g Zn needed (to 3 sig. figs.)

Explanation:people always get this wrong but i got you

You might be interested in
Explain the difference between wavelength and frequency
Katyanochek1 [597]

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave.Frequency (typically measured in Hertz) is the number of waves in a specific time . Frequency and wavelength have both direct and inverse relationships. The crucial difference between frequency and wavelength is that frequency shows the total number of wave oscillations in a given time. As against wavelength specifies the distance between two specific points of a wave.

Explanation:

Frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead. Frequency is how often something moves up and down in a second. If a bobble head moves forward and backward in one second then it has a bobbling frequency of 1 Hertz (Hz). The unit of frequency is Hertz (Hz) or # of cycles or oscillations per second. A wavelength is measured in distance like meters (m). For photons or light or radiowaves the equation is wavelength=speed of light/frequency.

4 0
3 years ago
What is the change in gravitational potential energy of an apple with a mass of 0.25 kg if it falls 0.7 m from a table. Estimate
Drupady [299]

Answer:

1.71675 J

Explanation:

Please mark Brainliest?

Hope this helps!

8 0
3 years ago
To convert measurements in the metric system you can move the decimal point left or right why does this work?
Serhud [2]

Explanation:

Because when you move the decimal point once, it it equal to 10 and to convert in the metric system, you must multiply or divide by 10. For example, when converting 4 centimeters to millimeters, you can multiply by 10 to get 40 millimeters or you can move the decimal point to the right and add another 0 to get 40.

3 0
3 years ago
Question: complete the mechanism for the below oxidation of an alkene with kmno4. draw the missing curved
iren2701 [21]

Mechanism for oxidation of alkene by KMnO₄ is provided in the attached image:

6 0
3 years ago
Help on question 1b please? (image attached)
aliya0001 [1]
I believe your answer Is C. An ammonia molecule has a trigonometrical pyramidal shape. Figure C has a <span>has a trigonometrical pyramidal shape.</span>

I hope I help
3 0
3 years ago
Other questions:
  • Name this compound: gaas
    15·2 answers
  • Predict which atom has a higher ionization energy. CL or I
    5·2 answers
  • In the electrolysis of molten coi3, which product forms at the cathode? 1. i2(g) 2. h2(g) 3. o2(g) 4. co(l)
    13·1 answer
  • Formula of acetic acid &amp; sodium acetate
    5·1 answer
  • Aluminum oxide (Al2O3) occurs in nature as a mineral called corundum, which is noted for its hardness and resis- tance to attack
    14·1 answer
  • Which best describes the climate of Antarctica?
    11·2 answers
  • Hakim used 18000J of energy to climb up to the top of a building in 10 mins. calculate the power he developed in climbing up to
    10·1 answer
  • Help and ill love you forever
    8·1 answer
  • Help-<br> Help-<br> Help-<br> Help?
    8·2 answers
  • Look at the two question marks between zinc (zn) and arsenic (as). at the time, no elements were known with atomic weights betwe
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!