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
Arte-miy333 [17]
3 years ago
11

A solution is to be prepared with a sodium ion concentration of 0.513 mol/L. What mass of sodium sulfate (g) is needed to prepar

e 1.98 liters of such a solution? Do not enter units with your answer.
Chemistry
2 answers:
Lilit [14]3 years ago
8 0

Answer:

We need 72.1 grams of Na2SO4

Explanation:

Step 1: Data given

sodium ion concentration = 0.513 mol/L

Volume = 1.98 L

Step 2: The balanced equation

Na2SO4 → 2Na+ + SO4^2-

Step 3: Calculate moles Na+

Moles Na+ = molarity Na+ * volume

Moles Na+ = 0.513 * 1.98 L

Moles Na+ = 1.01574 moles

Step 4: Calculate moles Na2SO4

For 1 mol Na2SO4 we need 2 moles Na+ and 1 mol SO4^2-

For 1.01574 moles Na+ we'll need 1.01574/2 = 0.50787 moles Na2SO4

Step 5: Calculate moles Na2SO4

Mass Na2SO4 = moles Na2SO4 * molar mass Na2SO4

Mass Na2SO4 = 0.50787 moles * 142.04 g/mol

Mass Na2SO4 = 72.1 grams

We need 72.1 grams of Na2SO4

Nastasia [14]3 years ago
7 0

Answer:

We should weigh 72.1 of sodium sulfate

Explanation:

The solution must be made of sodium sulfate. This salt can be dissociated like this:

Na₂SO₄ →  2Na⁺  +  SO₄⁻²

From this dissociation we can say that, 2 moles of sodium cation are obtained from 1 mol of salt.

Therefore 0.513 moles of sodium cation will be obtained from 0.2565 moles of salt (0.513 . 1) / 2. The thing is that this number are the moles contained in 1 L of solution, and we need to prepare such 1.98 L

Molarity = mol / Volume (L) → Molarity . volume (L) = mol

0.2565 mol/L . 1.98L = 0.508 moles

These are the moles we should weigh. Let's convert them to moles:

0.508 mol . 142.06 g / 1 mol = 72.1 g

You might be interested in
How Do You Know Whether an Object Has Potential
timofeeve [1]

The object that I think has potential energy within the images posted is the skateboard at the top of the ramp.

<h3>Why do i think this one has potential energy?</h3>

Potential energy is a type of mechanical energy in which there is a type of stored energy that can be transformed into another type of energy. This energy is given by the <u>location of the body</u> with respect to a force field.

I selected the image of the skateboard at the top of the ramp since going up there uses kinetic energy and when it is on top of the ramp, waiting to go down, this kinetic energy is stored in potential energy that is ready to be released. The higher the height at which it is launched, <u>the more its potential energy will be</u>.

Therefore, we can confirm that the object that I think has potential energy within the images posted is the skateboard at the top of the ramp.

To learn more about potential energy visit: brainly.com/question/24284560?referrer=searchResults

#SPJ1

5 0
1 year ago
THE BRAINLIEST ANSWER ASAP!! PLEASE HELP ME OR I FAIL!!! Describe some of the rules scientists follow to reflect the uncertainty
pshichka [43]
Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise. The goal of scientists is to obtain measured values that are both accurate and precise.

Suppose, for example, that the mass of a sample of gold was measured on one balance and found to be 1.896 g. On a different balance, the same sample was found to have a mass of 1.125 g. Which was correct? Careful and repeated measurements, including measurements on a calibrated third balance, showed the sample to have a mass of 1.895 g. The masses obtained from the three balances are in the following table:
5 0
3 years ago
A gaseous mixture contains 5.0 moles of nitrogen and 10.0 moles of helium . What is the total pressure if the temperature is 25
jolli1 [7]

Answer:

A) 122 atm

Explanation:

PV = nRT

Solve for P --> P = nRT/V

n = 10.0 mol + 5.0 mol = 15.0 mol

R = 0.08206 L atm / mol K

T = 25 + 273 = 298 K

V = 3.0

P = (15.0)(0.08206)(298) / (3.0) = 122 atm

6 0
3 years ago
Jordan is doing a science fair project on the effects of music on the growth of tomatoes. He has two tomato plants, Plant A and
algol [13]
The control group is the plant without the music because nothing is being done to it. while the experimental group is the plant with music because you are testing it in a different environment (the music).
6 0
3 years ago
Read 2 more answers
Reasons for taking the melting point of a solid sample
Rudik [331]

Definition of melting point:

The melting point of solid is defined as the temperature at which the solid exists in equilibrium with its liquid under an external pressure of one atmosphere.

Reason:

The melting point is an important physical property of a compound.

1) The melting point can be used to identify a substance.

2) As an indication of its purity.

5 0
4 years ago
Other questions:
  • Label the molecular shape around each of the central atoms in the amino acid glycine. hint
    11·2 answers
  • A 1000 L tank contains 500 L of water with a salt concentration of 10 g/L. Water with a salt concentration of 50 g/L flows into
    12·1 answer
  • Calculate the volume in milliliters of a iron(II) bromide solution that contains of iron(II) bromide . Round your answer to sign
    7·1 answer
  • What kind of toxic wastes are produced by nuclear energy?
    11·1 answer
  • A tank has 30 gallons of gasoline how many liters of gasoline are there in the tank
    13·2 answers
  • Which of the following are examples of electromagnetic waves?
    9·1 answer
  • Do nitrates always form precipitates?
    13·1 answer
  • I need help on this :/
    10·1 answer
  • What part of the atom is represented by the letter Z?
    13·1 answer
  • HELP PLEASE ASAP WILL MARK BRAINLIEST
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!