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
lesya692 [45]
3 years ago
8

Epsom salt is commonly purchased in the pharmacy for a variety of uses, anti-inflammatory, laxative, and cosmetic. epsom salt is

a hydrated salt of magnesium sulfate. if 2.000 g of epsom salt are heated to remove the waters of hydration, 0.977 g of the anhydrous (without water) magnesium sulfate, mgso4, were obtained. calculate the number of waters of hydration, and write the chemical formula of the epsom salt.
Chemistry
2 answers:
Dominik [7]3 years ago
4 0
Epsom salt is MgSO4.
We assume x water of hydration in the crystalline form.

Molecular mass of MgSO4 = 24+32+4*16=120
Molecular mass of MgSO4.xH2O = 120+18x

By proportion, 
2.000/0.977 = (120+18x)/120
Cross multiply
0.977(120+18x) = 120*2.000
from which we solve for x
17.586x+117.24 = 240
x=122.78/17.586
=6.980

Answer: there are 7 water of hydration in Epsom salt, according to the experiment.

Note: more accurate (proper) results may be obtained by using exact values (3-4 significant figures) in the molecular masses.  However, since water of hydration is the nearest integer, using approximate values (to at least two significant figures) suffice.
Anettt [7]3 years ago
3 0

The total weight (MgSO₄ + xH₂O) = 2.000 g

Weight of anhydrous, that is, without water magnesium sulfate = 0.977 g

Weight of xH₂O = 2.000 - 0.977 = 1.023 g

Moles of water = Weight / molecular mass

= 1.023 / 18 = 0.057  

Moles of MgSO₄ = 0.977 / 120.366 = 0.0081

0.0081 mole (0.977) MgSO₄ hydrated with = 0.057 mol of water

1 mole will react with = 7 mol of water

Chemical formula of the Epsom salt = MgSO₄.7H₂O


You might be interested in
I need help plz with the first question plz
Cloud [144]
Ok so put it in order
7 0
4 years ago
How does wind develop
avanturin [10]
It is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds that vary in speed. On Earth, air is also deflected by the Coriolis effect, except exactly on the equator.
8 0
3 years ago
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass
creativ13 [48]

The postulate of Dalton's atomic theory which is a result of the law of conservation of mass is: Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction.

8 0
3 years ago
Adding O2 to the reaction 6CO2 + 6H2O C6H12O6 + 6O2. WHICH WAY WILL THE REACTION SHIFT?
Oxana [17]

Answer:

The reaction will shift to the left to produce more reactants.

Explanation:

According to the Le- Chatelier principle,

At equilibrium state when stress is applied to the system, the system will behave in such a way to nullify the stress.

The equilibrium can be disturb,

By changing the concentration

By changing the volume

By changing the pressure

By changing the temperature

Consider the following chemical reaction.

Chemical reaction:

6CO₂ +  6H₂O  ⇄  C₆H₁₂O₆ + 6O₂

In this reaction the equilibrium is disturb by increasing the concentration of Product.

When the concentration of product is increased the system will proceed in backward direction in order to regain the equilibrium. Because when product concentration is high it means reaction is not on equilibrium state. As the concentration of O₂  increased the reaction proceed in backward direction to regain the equilibrium state and more reactant is formed.

4 0
3 years ago
A number should be rounded up if
Vedmedyk [2.9K]

Answer:

C.) The number after it is between 5 and 9

Explanation:

If the digit to the right is less than five, you must leave the digit you want to round to as it is.

But, if the digit to the right is greater than or equal to five, you must increase the value of the digit you're rounding to by one. And any remaining digits before the decimal point become zeros, and any that are after the decimal point are dropped.

Hope this helps you out! : )

6 0
3 years ago
Other questions:
  • A characteristic feature of any form of chromatography is the ________.a. calculation of an Rf value for the molecules separated
    13·1 answer
  • Correctly label the parts of the water cycle enter our answer in the space provided and include the question numbers
    11·1 answer
  • Which of the following is true for the equilibrium constant of a reaction? It is a ratio of the concentrations in a reaction. It
    15·1 answer
  • Which is the correct answer???????
    6·1 answer
  • ______________ is the process of translating a message received into understandable language or symbols.
    12·1 answer
  • What will be the amount of sugar in milligrams if the size of the milk chocolate bar is reduced from 12.630 g to 4.000 g ?
    12·1 answer
  • What is the pH of a 5.41g of HNO3 in 7L of solution? (mass of HNO3=63.02g)
    14·1 answer
  • What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies.
    10·1 answer
  • QUESTION 4
    7·1 answer
  • Why is copper used to make electric wires?​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!