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
Dennis_Churaev [7]
4 years ago
13

A hygroscopic compound readily absorbs water from the air. This water can be removed by gently heating the compound. 5.24 g of a

hygroscopic compound was heated to remove the absorbed water. After heating the dry compound had a mass of 4.16 g. What was the mass percent of water in the original compound?
Chemistry
1 answer:
olchik [2.2K]4 years ago
4 0

Answer:

This means 20.6% of the original hygrocopic compound is water

Explanation:

<u>Step 1:</u> Given data

A hygroscopic compound weighs 5.24 grams

To remove the absorbed water the compound is heated.

After the heating process, the compound weighs 4.16 grams

<u>Step 2:</u> Calculate the mass of the water

The total mass of the hygroscopic compound = mass of water + mass of dry compound

The mass of water = The total mass of the hygroscopic compound - mass of dry compound

The mass of water = 5.24 grams - 4.16 grams = 1.08 grams

<u>Step 3: </u>Calculate the mass percent of water in the original compound

1.08g / 5.24g *100% = 20.6%

<u>Step 4: </u>To control this we can calculate the mass percent of the dry compound

4.16g / 5.24g *100 % = 79.4%

20.6% + 79.4% = 100%

This means 20.6% of the original hygrocopic compound is water

You might be interested in
Total solar eclipses are common and happen every month at the beginning of the new lunar cycle.
Bogdan [553]
False, solar eclipses happen when the moon moves between the Sun and the Earth, blocking the Sun's rays and casting a shadow on Earth. It happens about once every 18 months (on average)
7 0
4 years ago
A certain reaction has an enthalpy of Δ=44 kJ and an activation energy of a=61 kJ. What is the activation energy of the reverse
avanturin [10]

Answer:

E = 17 kJ

Explanation:

The enthalpy of the reaction is:

\Delta H = E_{p} - E_{r}  

<u>Where</u>:

Ep: is the energy of the products

Er: is the energy of the reactants

Similarly, the enthalpy of the reaction is related to the activation energy forward (E_{F}) and to the activation energy reverse (E_{R}) as follows:

\Delta H = E_{F} - E_{R}  

Having that ΔH = 44 kJ and E_{F} = 61 kJ, the activation energy of the reverse reaction is:

E_{R} = E_{F} - \Delta H = 61 kJ - 44 kJ = 17 kJ  

Therefore, the activation energy of the reverse reaction is 17 kJ.

I hope it helps you!

3 0
3 years ago
PLS help, 20 points for you<br><br> I need a Molecular, and Ionic equations:<br> H2CO3 + LiOH -
STatiana [176]

The molecular equation of H₂CO₃ and LiOH:

H₂CO₃ (aq) + 2LiOH (aq) →  Li₂CO₃ (aq)  + 2H₂O (l)

The net ionic equation of the reaction of H₂CO₃ and LiOH:

H⁺ (aq)  + OH⁻ (aq)  →  H₂O (l)

<h3>What are the net ionic equations?</h3>

The net ionic equation of a chemical reaction can be described as an equation that expresses only those ions, elements, or compounds, that directly contributed to that chemical reaction.

The chemical equation for the reaction of H₂CO₃ and LiOH:

H₂CO₃ (aq) + LiOH (aq) →  Li₂CO₃ (aq)  + 2H₂O (l)

The complete ionic equation for the above reaction H₂CO₃ and LiOH is:

2H⁺ (aq) +  CO₃²⁻ (aq) + 2Li⁺ (aq) + 2OH⁻  → 2Li⁺ (aq) + CO₃²⁻(aq) + 2H₂O (l)

In the ionic equation, the Lithium and carbonate ions appear unchanged on both sides of the equation. When we mix the two solutions, neither the Lithium nor carbonate ions participate in the reaction. So Lithium and carbonate ions can be eliminated from the ionic equation.

H⁺ (aq)  + OH⁻ (aq)  →  H₂O (l)

Learn more about the net ionic equation, here:

brainly.com/question/15466794

#SPJ1

6 0
1 year ago
Max discovered a beaker full of transparent liquid in the science lab. He hypothesized that since the liquid is transparent like
S_A_V [24]

B. Test a hypothesis by gathering data

Seriously though, what type of guy thinks "oh hey there's a transperent liquid in the science lab? yeah it's water."

6 0
4 years ago
Complete the following sentences: 1. The phase change in which a substance changes from a liquid to a gas is ______.
DanielleElmas [232]
1. <span>The phase change in which a substance changes from a liquid to a gas is condensation. The correct option among all the options given is option "c".

2. </span>The phase change in which a substance changes from a solid to a liquid is melting. The correct option among all the options given is option "b".

3. The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first is sublimation. The correct option is option "a".
6 0
4 years ago
Read 2 more answers
Other questions:
  • Which statement is a hypothesis?
    10·2 answers
  • Which of the following most likely explains why the chemical symbol for calcium is Ca?
    5·1 answer
  • The most probable mechanism of reactivity for the solvolysis of 2-chloro-norbornane is
    14·1 answer
  • Which subatomic particals are located within the nucleus of the atom
    7·2 answers
  • What makes an atom neutral
    5·1 answer
  • What is the name of the scientist who discovered the electron
    8·1 answer
  • Propane (C3H8) can be burned to produce heat for homes. The products of the reaction are CO2 and H2O. For complete combustion to
    5·1 answer
  • Why is an element considered a pure substance​
    11·2 answers
  • ESKIETTTTT plzzz lil pump needs your help‼️​
    8·2 answers
  • What phase change is the following substance undergoing?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!