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
ArbitrLikvidat [17]
3 years ago
12

How many moles of each substance are needed to prepare the following solutions?

Chemistry
1 answer:
Afina-wow [57]3 years ago
4 0
A) 7.5 % m / V 

7.5 g -------- 100 mL ( solution )
mass g ------ 45.0 mL

mass g = 45.0 x 7.5 / 100

mass g = 337.5 / 100 => 3.375 g

1 mole KCl -------------- 74.55 g
moles KCl ---------------- 3.375 g

moles KCl = 3.375 x 1 / 74.55 => 0.0452 moles of KCl
______________________________________________

b) 9.5 % ( m / V ) :

9.5 g -------- 100 mL ( solution )
mass g ------ 400.0 mL

mass g = 400.0 x 9.5 / 100

mass g = 3800 / 100 => 38 g

1 mole acetic acid -------------- 60.05 g
moles acetid acid  ---------------- 38 g

moles acetid acid = 38 x 1 / 60.05 => 0.6328 moles of  acetid acid<span> 
</span>______________________________________________________

hope this helps!


You might be interested in
How to reproduce with a dolphin?<br> and how long will it take for the dolphin baby to come out?
Sedaia [141]
Answer. Dolphin reproduction starts when a couple of dolphins mate. The copulation occurs belly to belly initiating the gestation period which varies according to the species but ranges from 11 to 17 months in the case of the killer whale, being 12 months for the common bottlenose dolphin.

6 0
3 years ago
Which of the following statement is not true?
Helga [31]

Answer: 2

Explanation: Greenhouse gases are very important in keeping our planet just right. If we have too many Greenhouse gases it would be too hot, but we can't eliminate all of them or it will be too cold

8 0
3 years ago
The chemical properties of an atom are determined by while bonding is determined by the .
Alenkasestr [34]

The chemical properties of an atom are determined by the number of the electrons while bonding is determined by the arrangement and the valency of the electrons.

<h3>What is an Atom?</h3>

The smallest component of ordinary stuff that makes up a chemical element is an atom.  Atoms that are neutral or ionized make up every solid, liquid, gas, and form of plasma. Atoms are incredibly tiny, measuring typically 100 picometers across. Due to quantum effects, they are so small that it is impossible to predict their behavior with sufficient accuracy using classical physics, as would be the case, for example, if they were tennis balls.

Each atom is made up of a nucleus and one or more electrons that are linked to it. One or more protons and a significant number of neutrons make up the nucleus. Only the most prevalent type of hydrogen is neutron-free. The nucleus of an atom contains more than 99.94% of its mass.

Learn more about Atom with the help of the given link:

brainly.com/question/22114450

#SPJ4



7 0
2 years ago
When objects touch each other, charge can be transferred by
Dovator [93]

Answer:

friction

Explanation:

electrons from one uncharged object to another uncharged object by rubbing. When two uncharged objects rub together, some electrons from one object can move onto the other object. hope this is your right

and not just a riddle

7 0
3 years ago
What is the name of Fe(OH)3
Pani-rosa [81]

Answer:Iron(|||) Hydroxide

Explanation:Fe is iron and OH is hydroxide

4 0
3 years ago
Other questions:
  • Why are low sulfur fuels an advantage to the environment
    13·1 answer
  • PLZ HELP HURRY PLZZZZZ WILL GIVE BRAINLIEST
    12·1 answer
  • How many sig figs does each number have below?
    8·1 answer
  • Hexylresorcinol, an antiseptic ingredient used in mouthwashes and throat lozenges, has the IUPAC name of 4-hexylbenzene-1,3-diol
    13·1 answer
  • Mrs. Rushing has 3 chemistry classes with 24 students in each. An experiment calls for each student to use 4 test tubes. How man
    11·2 answers
  • What is the ground state shorthand notation for mercury (Hg)?
    15·2 answers
  • A gas occupies 3.5L at 2.5 atm of pressure. What is the volume at 787 torr at the same temperature?
    10·1 answer
  • Select all the correct answers.
    14·2 answers
  • Help !!! what is the answer ?!?!
    5·1 answer
  • Calculate the concentration (M) of sodium ions in a solution made by diluting 10.0 mL of a 0.774 M solution of sodium sulfide to
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!