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
Strike441 [17]
3 years ago
6

You are given an unknown mixture containing NaCl and NaHCO3. When you carry out the heating exactly as described in part A, only

NaHCO3 decomposes. From the loss in mass, you can calculate the amount of NaHCO3 present in the mixture and its mass percent composition.
Here is your data. Incorporate it in your written procedure.

Experimental data Unknown (NaCl + NaHCO3)
Mass of crucible + cover 72.428 g
Mass of crucible + cover + mixture 74.80 g
Mass of crucible + cover + residue (1st heating) 74.25 g
Mass of crucible + cover + residue (2nd heating) 74.24 g
Mass of crucible + cover + residue (3rd heating) 74.24

From the data above, carry out your calculation for finding the mass of mixture, and mass of final solid remaining in the crucible. Using the knowledge that only loss of mass due to CO2 and H2O can be linked to the original mass of NaHCO3, calculate the mass of NaHCO3 and percent of NaHCO3 in the mixture.
Chemistry
1 answer:
SOVA2 [1]3 years ago
7 0

Answer:

1.52g NaHCO3 were in the original mixture.

Mass percent: 64.1%

Explanation:

When NaHCO3 heats it descomposition occurs as follows:

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g).

The loss in mass is because of the evaporization of CO2 and H2O. As both are in the same porportion, its molar mass is the sum of both compounds (44g/mol + 18g/mol = 62g/mol)

Loss in mass: 74.80g - 74.24g = 0.56g.

In moles:

0.56g * (1mol / 62g) = 0.00903 moles of gas.

As 1 mole of the gases comes from 2 moles of NaHCO3:

<em>Moles NaHCO3:</em>

0.00903 moles of gas * (2 moles NaHCO3 / 1 mole gas) = 0.018 moles NaHCO3.

In grams (Molar mass NaHCO3: 84g/mol):

0.018 moles NaHCO3 * (84g / mol) = 1.52g NaHCO3 were in the original mixture.

The mass of the mixture was:

74.80g - 72.428g = 2.372g

That means mass percent of NaHCO3 is:

(1.52g /  2.372g) * 100 =  64.1%

You might be interested in
Help plz!
Feliz [49]

Answer:

hi! I hope your having a awesome day

Explanation:

6 0
3 years ago
All of the following are agents of mechanical weathering EXCEPT ___________. wind temperature water gravity
Iteru [2.4K]
Gravity: that's a force.
3 0
3 years ago
Read 2 more answers
What’s a black dwarf
Helga [31]

Answer:

you

Explanation:

7 0
3 years ago
Read 2 more answers
What is the approximate value of the ccc bond angle in ch3ch2ch2oh
Fynjy0 [20]

Answer:

The value of the carbon bond angles are 109.5 °

Explanation:

CH3CH2CH2OH = propanol . This is an alcohol.

All bonds here are single bonds.

Single bonds are sp³- hybdridization type. To be sp3 hybridized, it has an s orbital and three p orbitals : sp³. This refers to the mixing character of one 2s-orbital and three 2p-orbitals. This will  create four hybrid orbitals with similar characteristics.

Sp3- types have angles of 109.5 ° between the carbon - atoms.

This means that the value of the carbon bond angles are 109.5 °

6 0
3 years ago
How much would a 10 kg suitcase weigh on the surface of…? a. The Moon b. Mars c. Saturn d. Pluto
alukav5142 [94]

Answer:

Is this the full question

Explanation:

Reply or love the message so i can get a notification

8 0
2 years ago
Other questions:
  • What is the frequency of a wave?
    11·2 answers
  • Which phrase describes an irregular galaxy?
    8·2 answers
  • What is the meaning of polyatomic
    7·1 answer
  • Which of the following household appliances is designed to directly convert electrical energy to heat energy?
    9·2 answers
  • Density can be calculated by dividing the mass of an object by its volume. Water has a density of 1g/ml. If an object’s density
    13·2 answers
  • A voltaic cell is constructed in which the anode is a Zn|Zn2+ half cell and the cathode is a Fe2+|Fe3+ half cell. The half-cell
    5·1 answer
  • PLEASE HELP ME! I really need help coming up with a three course meal idea, I need this for chemistry, can someone help me pleas
    12·1 answer
  • When you throw a rock, you are ________ energy.
    7·1 answer
  • Which situation has given to a trait that could be passed on to offspring ?
    11·1 answer
  • What is the name of the high-energy molecule used by cells?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!