All categories

3 years ago

25.0 g of barium hydroxide is dissolved in 120.0g of water. What is the morality?

1 answer:

3 0

Molarity: M = #moles of solute / liters of solution

# moles = mass / molar mass

Molar mass calculation

Barium hydroxide = Ba (OH)2

Atomic masses
Ba = 137.4 g/mol
O=16 g/mol
H=1 g/mol
Molar mass of Ba (OH)2 = 137.4 g/mol + 2*16g/mol + 2*1 g/mol = 171.4 g/mol

# mol = 25.0g/171.4 g/mol = 0.146 mol

For the volume of water use the fact that the density is 1g/ml., so 120 g = 120 ml = 0,120 liters.

M = 0.146mol / 0.120 liters = 1.22 mol/liter

You might be interested in

Why is it important to have long term measurements when studying ecosystems

Alex Ar [27]

Because ecosystems don't change over one day, they change over a long period of time. Plus, something that happens may be because of more than just one change.

5 0

2 years ago

Medical diagnosis and ______ are common uses of radioactive elements in health care.

KengaRu [80]

<span>The half-life of Carbon 14 and radionuclides are used to estimate the absolute (versus relative) age of pre-history items </span>

6 0

2 years ago

When a piece of metal is irradiated with UV radiation (λ = 162 nm), electrons are ejected with a kinetic energy of 3.54×10-19 J.

dsp73

We have that the work function of the metal

$\phi=1.227*10^{-18}J$

From the Question we are told that

UV radiation (λ = 162 nm)

Kinetic energy $K.E =3.54*10-19 J.$

Generally the equation for Kinetic energy is mathematically given as

$KE =\frac{hc}{\pi-\phi} \\\\\phi =\frac{ 6.626*10^{-34} * 3*10^8}{162*10^{-9} -3.54*10^{-19}}$

$\phi=1.227*10^{-18}J$

For more information on this visit

brainly.com/question/12669551?referrer=searchResults

8 0

3 years ago

I Need help with this worksheet I Need the Work Please Thank you

Komok [63]

1. a. 3

b. 2

2. a. 4

b. 6

3. a. 1

b. 2

4. a. 5

4 0

2 years ago

Describe the type of force which exists between particles in an Ideal gas. Explain why this type of force exists between the par

aksik [14]

The Intermolecular force is a type of force which exists between particles in an Ideal gas.

<h3>What type of force which exists between particles in an Ideal gas?</h3>

Intermolecular forces are considered weaker attractions that hold molecules in gas close together. This force of attraction is present between molecules or particles.

So we can conclude that the Intermolecular force is a type of force which exists between particles in an Ideal gas.

Learn more about attraction here: brainly.com/question/1308963

#SPJ1

8 0

1 year ago