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
anastassius [24]
2 years ago
5

Oxygen, Sulfur, and Selenium make up a triad. The atomic mass of oxygen is 15.999 amu, the atomic mass of selenium is 78.96 amu.

Use this information to calculate the atomic mass of sulfur.
Chemistry
1 answer:
3241004551 [841]2 years ago
6 0

Answer:

Explanation:

Selenium is a chemical element with the symbol Se and atomic number 34.

...

Selenium

Melting point 494 K ​(221 °C, ​430 °F)

Boiling point 958 K ​(685 °C, ​1265 °F)

Density (near r.t. ) gray: 4.81 g/cm3 alpha: 4.39 g/cm3 vitreous: 4.28 g/cm3

when liquid (at m.p. ) 3.99 g/cm3

You might be interested in
State the building blocks for all the macromolecules
murzikaleks [220]

Answer:

<h2>Carbohydrates, Lipids, Proteins, and Nucleic Acids</h2>

5 0
2 years ago
Read 2 more answers
How does an increase in temperature affect the equilibrium concentration of the underlined substance and K for each of the follo
Darya [45]

Explanation:

Due to the positive value of the change in temperature, this is an endothermic reaction.

Since the forward reaction is endothermic, increasing the temperature increases the equilibrium constant (k).

In an equilibrium system, the position of the equilibrium will move in a way to annul the change made to the system. An increase in temperature for an endothermic reaction would favour the reaction, leading to increase in amount of products and decrease in amount of reactants.

3 0
3 years ago
Sonja and Jeremy performed several experiments to show how changes in temperature affected the volume of an inflated balloon. Th
ycow [4]

Answer:

They also showed the effects of pressure on volume if temperature stayed the same

Explanation:

They also showed the effects of pressure on volume if temperature stayed the same is the experiment that will provide an evidence for Boyle's law.

Boyle's law states that "the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant".

  • The law is an affirmation of what happens when there is a dynamics between pressure and volume if temperature is made constant.
  • So the experiment designed to investigate this proves and shows Boyle's law.
8 0
3 years ago
Read 2 more answers
How long will it take for a 750 mg sample of radium with a half life of 15 days to decay to exactly 68mg?
weqwewe [10]

Answer:

52 da  

Step-by-step explanation:

Whenever a question asks you, "How long to reach a certain concentration?" or something similar, you must use the appropriate integrated rate law expression.

The i<em>ntegrated rate law for a first-order reaction </em>is  

ln([A₀]/[A] ) = kt

Data:

[A]₀ = 750 mg

 [A] =    68 mg

t_ ½ =   15 da

Step 1. Calculate the value of the rate constant.

 t_½ = ln2/k     Multiply each side by k

kt_½ = ln2         Divide each side by t_½

      k = ln2/t_½

         = ln2/15

         = 0.0462 da⁻¹

Step 2. Calculate the time

ln(750/68) = 0.0462t

         ln11.0 = 0.0462t

            2.40 = 0.0462t     Divide each side by 0.0462

                   t = 52 da

8 0
3 years ago
Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + N2(g) → 2Li3N(s) How many moles of lit
miss Akunina [59]

Answer:

12.5 g of Li are needed in order toproduce 0.60 moles of Li₃N

Explanation:

The reaction is:

6Li(s) + N₂(g) → 2Li₃N(s)

If nitrogen is in excess, the lithium is the limiting reactant.

Ratio is 2:6

2 moles of nitride were produced by 6 moles of Li

Then, 0.6 moles of nitride were produced by (0.6 .6)/ 2 = 1.8 moles of Li

Let's convert the moles to mass → 1.8 mol . 6.94 g/ 1mol = 12.5 g of Li

7 0
3 years ago
Read 2 more answers
Other questions:
  • Consider this reaction: H2S + HNO3 S + NO + H2O Reduction half-reaction: N+5 + 3e- N+2 Oxidation half-reaction: S-2 S + 2e- Afte
    8·2 answers
  • Water is a produced when 30.0 grams of hydrogen reacts with 80.0 grams of oxygen what is the limiting reagent
    6·1 answer
  • Based on current information, cosmologists expect the universe to _____.
    7·1 answer
  • Based on your energy level calculations, predict the photon energies that would be emitted by transitions between the hydrogen e
    7·1 answer
  • Explain why clouds are generally observed to form only in the troposphere?
    8·2 answers
  • A train travels 380 miles in 5 hours 15 minutes. Calculate its<br> average speed.
    13·1 answer
  • Are there Muslims?<br> For Muslims
    8·2 answers
  • And a 40N Torce in a southeriy direction?
    9·1 answer
  • Why is the top ruler more reliable in measuring length than the bottom ruler?
    7·2 answers
  • What is the name of bird W?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!