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
Flura [38]
2 years ago
10

Sodium hydroxide reacts with aluminum and water to produce hydrogen gas: 2 Al(s) + 2 NaOH(aq) + 6 H2O(l) → 2 NaAl(OH)4(aq) + 3 H

2(g) What t mass of hydrogen gas would be formed from a reaction of 1.83 g Al and 4.30 g NaOH in water?
Chemistry
1 answer:
lianna [129]2 years ago
6 0

Answer:

The mass of hydrogen gas formed is 0.205 grams

Explanation:

<u>Step 1:</u> Data given

Mass of 1.83 grams of Al

Mass of NaOH = 4.30 grams

Molar mass of Al = 26.98 g/mol

Molar mass of NaOH = 40 g/mol

<u>Step 2:</u> The balanced equation:

2 Al(s) + 2 NaOH(aq) + 6 H2O(l) → 2 NaAl(OH)4(aq) + 3 H2(g)

<u>Step 3:</u> Calculate moles of Al

Moles Al = mass Al / Molar mass Al

Moles Al = 1.83 grams / 26.98 g/mol

Moles Al = 0.0678 moles

<u>Step 4:</u> Calculate moles of NaOH

Moles NaOH = 4.30 grams / 40 g/mol

Moles NaOH = 0.1075 moles

<u>Step 5</u>: Calculate limiting reactant

For 2 moles of Al, we need 2 moles of NaOH

Aluminium is the limiting reactant. It will completely be consumed ( 0.0678 moles)

NaOH is in excess. There will react 0.0678 moles

There will remain 0.1075 - 0.0678 = 0.0397 moles

<u>Step 6</u>: Calculate moles of hydrogen

For 2 moles of Al, we need 2 moles of NaOH, to produce 3 moles of hydrogen

For 0.0678 moles of Al, there is produced 0.0678 *3/2 = 0.1017 moles of H2

<u>Step 7</u>: Calculate mass of H2

Mass of H2 = Moles H2 * Molar mass of H2

Mass of H2 = 0.1017 moles * 2.02 g/mol

Mass of H2 = 0.205 grams

The mass of hydrogen gas formed is 0.205 grams

You might be interested in
Identify which of the following statements are true. Check all that apply. Check all that apply. Ionization energies are always
AURORKA [14]

Answer:

The second ionization energy of an atom is always greater than its first ionization energy.

Explanation:

<em>Ionization energies are always negative quantities.</em> FALSE. Ionization energies are always positive because they represent the energy that has to be added to a neutral gaseous atom to remove 1 electron. By convention, energy absorbed goes with the positive sign.

X(g) + 1 I.E. ⇒ X(g)⁺ + 1 e⁻

<em>Oxygen has a larger first ionization energy than fluorine.</em> FALSE. First ionization energy  (1 I.E) is the energy required to remove 1 electron from a neutral gaseous atom. First ionization energy for Oxygen is 13.61 eV and for Fluorine is 17.42 eV, that is, more energy is required to remove an electron from F than from O.

<em>The second ionization energy of an atom is always greater than its first ionization energy.</em> TRUE. The energy required to remove 1 electron from a +1 cation (second ionization energy) is always greater than the first ionization energy because of the attraction between the cation and the electron.

X(g)⁺ + 2 I.E. ⇒ X(g)⁺² +  1 e⁻

<em>The third ionization energy is the energy needed to ionize three electrons from a neutral atom.</em> FALSE. The third ionization energy (3 I.E.) is the energy required to remove 1 electron from a +2 cation.

X(g)⁺² + 3 I.E. ⇒ X(g)⁺³ +  1 e⁻

4 0
3 years ago
Is tantalum radioactive?
Slav-nsk [51]
There are certain processes in nature that produce many of these radioactive<span>isotopes. For instance, some </span>radioactive<span> nitrogen is produced in the atmosphere when high energy cosmic radiation from the sun hits the earth. Other </span>radioactive<span>isotopes are only available by artificial production.  good luck</span>
7 0
3 years ago
What type of compound is composed of covalently bonded atoms and has a high melting point?
MaRussiya [10]
The correct answer is C. complex sold compound

hope this helps you
5 0
3 years ago
Which trait is shown when scientists ignore their personal bias while assessing an idea?
Zinaida [17]

Answer: I think the answer is C

Explanation:

3 0
3 years ago
Read 2 more answers
What information can you figure out about an atom using only the atomic number?​
KiRa [710]
The number of protons
4 0
2 years ago
Read 2 more answers
Other questions:
  • A radioisotope has a half-life of 12 days. If a sample is measured to contain 5 grams of radioisotope, how much time has passed
    9·1 answer
  • The eastern coast of South America and the western coast of Africa are separated by the Atlantic Ocean. If scientists find the s
    9·1 answer
  • 72 Points Please Answer! An organism has the scientific name Canis lupus. Using complete sentences, write the information that y
    13·1 answer
  • Explain the difference between a sea-level transgression and regression.
    14·2 answers
  • The equation for photon energy, E, is E=hc/λ
    7·1 answer
  • What concentration of so32– is in equilibrium with ag2so3(s) and 2.60 × 10-3 m ag ? the ksp of ag2so3 can be found here?
    14·1 answer
  • Suppose two gases in a container have a total pressure of 1.20 atm. What is the pressure of Gas B if the partial pressure of Gas
    12·2 answers
  • How does the alcohol enter the body? Describe the process. Where does most of the absorption take place?
    10·1 answer
  • Calculate the maximum concentration (in m) of calcium ions (Ca2+ ) in a solution that contains of CO3^2-. The ksp of CaCO3 is?
    9·1 answer
  • Calculate the volume in (L) of 1.13x10^5 grams of liquid sodium which has a density of 0.929g/cm3
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!