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
Evgen [1.6K]
2 years ago
11

What is the molar mass for Li2S?

Chemistry
1 answer:
drek231 [11]2 years ago
7 0

Answer:

44.882

Explanation:

Li2S is made up of 2 Li and 1 S

Li's molar mass is 6.941 * (2) = 13.882

S's moalr mass is 32 * (1) = 32

add 12.882 + 32 = 44.882

let me know if you have questions!

You might be interested in
Use the drop-down menu to complete the statement. The atoms in a ... have a definite volume, but move quickly enough to overcome
finlep [7]

Answer:

Luiquid

Explanation:

The atoms in a liquid state of matter have a definite volume, eventhough they acquire the shape of the container that contains them, the volume will always be the same, while in a solid the shape and volume will remain constant, on the other hand for a gas, the substance will fill the container where it is, having different volumes.

4 0
3 years ago
Read 2 more answers
A 25.00 ml solution of sulfuric acid H2SO4 is titrated to phenolphthalein end point with 27.00 ml of 1.700 M KOH
Nastasia [14]
<h3>Answer:</h3>

0.918 M

<h3>Explanation:</h3>

Assuming the question requires we calculate the Molarity of sulfuric acid:

We are given:

  • Volume of the acid, H₂SO₄ = 25.00 ml
  • Volume of the base, KOH = 27.00 mL
  • Molarity of the base, KOH is 1.70 M

We can calculate the molarity of the acid using the following steps;

<h3>Step 1: Write the chemical equation for the reaction.</h3>

The reaction is an example of a neutralization reaction where a base reacts with an acid to form salt and water.

Therefore, the balanced equation will be;

H₂SO₄(aq) + 2KOH(aq) → K₂SO₄(aq) + 2H₂O(l)

<h3>Step 2: Determine the moles of the base, KOH </h3>

When given molarity and the volume of a solution, the number of moles can be calculated by multiplying molarity with volume.

Number of moles = Molarity × Volume

                             = 1.700 M × 0.027 L

                              = 0.0459 moles

Thus, moles of KOH used is 0.0459 moles

<h3>Step 3: Determine the number of moles of the Acid, H₂SO₄</h3>

From the reaction, 1 mole of the acid reacts with 2 moles of KOH

Therefore, the mole ratio of H₂SO₄ to KOH is 1 : 2

Thus, moles of H₂SO₄ = Moles of KOH ÷ 2

                                     = 0.0459 moles ÷ 2

                                     = 0.02295 moles

<h3>Step 4: Calculate the molarity of the Acid </h3>

Molarity is the concentration of a solution in moles per liter

Molarity = Moles ÷ Volume

Molarity of the acid = 0.02295 moles ÷ 0.025 L

                                = 0.918 M

Thus, the molarity of the acid, H₂SO₄ is 0.918 M

5 0
3 years ago
What fraction of a Sr-90 sample remains unchanged after 87.3 years
jolli1 [7]
The answer is 1/8.

Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. (1/2)^{n} = x,
where:
<span>n - a number of half-lives
</span>x - a remained fraction of a sample

2. t_{1/2} = \frac{t}{n}
where:
<span>t_{1/2} - half-life
</span>t - <span>total time elapsed
</span><span>n - a number of half-lives
</span>
The half-life of Sr-90 is 28.8 years.
So, we know:
t = 87.3 years
<span>t_{1/2} = 28.8 years

We need:
n = ?
x = ?
</span>
We could first use the second equation, to calculate n:
<span>If:
t_{1/2} = \frac{t}{n},
</span>Then: 
n = \frac{t}{ t_{1/2} }
⇒ n = \frac{87.3 years}{28.8 years}
⇒ n=3.03
<span>⇒ n ≈ 3
</span>
Now we can use the first equation to calculate the remained amount of the sample.
<span>(1/2)^{n} = x
</span>⇒ x=(1/2)^3
⇒x= \frac{1}{8}<span>
</span>
8 0
3 years ago
Describe the factors that affect the force of gravity
guajiro [1.7K]

Answer:

gravity

Explanation:

gravity

7 0
2 years ago
What is the answer for this!! plz it due today 5/6/20!!!
Furkat [3]

Answer:)

1. d

2.c

3.c

4.b

Explanation:

Because im smart

7 0
3 years ago
Other questions:
  • 1.)Which is the correct order of the organization of the human body?
    8·2 answers
  • Balance the following chemical equation.​​​​​​​(2)
    12·1 answer
  • What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the so
    7·1 answer
  • The first-order rate constant for the decomposition of N2O5:
    6·1 answer
  • Hat is the definition for a scientific theory? A. an informed explanation that can be tested but is not widely accepted B. an ex
    6·2 answers
  • How many valence electrons are in atom of sulfur?
    10·1 answer
  • the student records the concentration of the stock solution of H2O2 to be 0.950 M. The student proceeds to prepare the reaction
    10·1 answer
  • What is the size of Neptune and the state of matter?
    13·1 answer
  • . How many grams of magnesium chloride can be produced by reacting 2 moles of chlorine gas with excess magnesium bromide? ____Cl
    13·1 answer
  • Why do we need a “mole”?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!