The substance krypton has the following properties normal melting point 115.9 K normal boiling point: 119.8 K triple point: 0.72 atm. 115.8 K critical point: 54.3 atm. 209.4 K A sample of krypton at a pressure of 1.00 atm and a temperature of 149.2 K is cooled at constant pressure to a temperature of 107.8 K Which of the following are true?
a) The final state of the substance is a solid
b) One or more phase changes will occur
c) The final state of the substance is a liquid
d) The sample is initially a gas
e) The solid initially present will vaporize.

Answer:

is there a picture or something?

Explanation:

Explanation:

Your question is incomplete please update it.

Answer:

Mg(NO4)2 is 180.3 g/mol

Explanation:

First find the substance formula.

Magnesium Nitrate.

Magnesium is a +2 charge.

Nitrate is a -1 charge.

So to balance the chemical formula,

We need 1 magnesium atom for every nitrate atom.

2(1) + 1(-2) = 0

So the substance formula is Mg(NO4)2.

Now find the molar mass of Mg(NO4)2.

Mg = 24.3 amu

N = 14.0 amu

O = 16.0 amu

They are three nitrogen and twelve oxygen atoms.

So you do this: 24.3 + 14.0(2) + 16.0(8) = 180.3 g/mol

So the molar is mass is 180.3 g/mol.

The final answer is Mg(NO4)2 is 180.3 g/mol

Hope it helped!

Answer:

yes

Explanation:

2.51 mol Cu

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

1.51 × 10²⁴ atoms Cu

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2.50747 mol Cu ≈ 2.51 mol Cu

Answer:

C

Explanation:

Answer:

The temperature at which rhenium becomes superconducting is -271.6 ºC.

Explanation:

We can convert the temperature given in Kelvin, which is an absolute scale, into degrees Celsius. which is a relative scale, by a simple algebraic translation, that is:

[tex]T_{C} = T_{K} - 273[/tex] (1)

Where:

[tex]T_{C}[/tex] - Temperature, measured in degrees Celsius.

[tex]T_{K}[/tex] - Temperature, measured in Kelvins.

If we know that [tex]T_{K} = 1.4\,K[/tex], then the temperature given in degrees Celsius is:

[tex]T_{C} = 1.4\,K-273[/tex]

[tex]T_{C} = -271.6\,^{\circ}C[/tex]

The temperature at which rhenium becomes superconducting is -271.6 ºC.

Answer:

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Explanation:

)??

Answer:

KBr

Explanation:

A metal has a very high melting point. Aluminum is a metal.

Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.

KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.

Answer:

3.41 g

Explanation:

A chemist adds 260.0 mL of a 0.0832M potassium permanganate solution to a reaction flask. Calculate the mass in grams of potassium permanganate the chemist has added to the flask. Round your answer to 3 significant digits.

Step 1: Given data

Volume of the solution (V): 260.0 mL (0.2600 L)

Concentration of the solution (C): 0.0832 M (0.0832 mol/L)

Step 2: Calculate the moles (n) of potassium permanganate added

We will use the following expression.

n = C × V

n = 0.0832 mol/L × 0.2600 L = 0.0216 mol

Step 3: Calculate the mass corresponding to 0.0216 moles of potassium permanganate

The molar mass of potassium permanganate is 158.03 g/mol.

0.0216 mol × 158.03 g/mol = 3.41 g

Answer:

1.204×10^24 particles of element

Explanation:

1mol=6.02×10^23 number of particles (in this case an element)

2mol=(6.02×10^23)×2 particles of the element

=1.204×10^24 particles of element

*be careful aware significant digits

Answer:

3,4,5,6,7,8

Explanation:

Groups 13  - 18 are the main group on the periodic table

The group number corresponds the number of valence electrons they contains.

Valence electrons are the number of electrons in the outermost shell of an atom.

So group 13 - 18 corresponds to a valency of 3,4,5,6,7,8.

Groups with a valency of 8 are the noble gases.

The mole fraction of cation (Al)=0.4

Given

1 M of Aluminium sulphate​

Required

The mole fraction of cation

Solution

Ionization of the Aluminum sulfate solution( assume 1 L solution ) :

mol Al₂(SO₄)₃ = M x V = 1 M x 1 L = 1 mol

Al₂(SO₄)₃⇒2Al³⁺ + 3SO₄²⁻

1 mol          2 mol   3 mol

From this equation, total mol in solution = 2+3 = 5 moles

Mol fraction Al(as a cation) :

= 2/5=0.4

Answer:

In explanation.

Explanation:

Physical changes are generally changes in states of matter. So, the water going from liquid to gas is a phase change and therefore physical. (It's still water, just in a different form). Im not sure about the second piece of evidence though. Unless you are talking about the Mac and Cheese which in that case is also a physical change as the two ingredients cheese and macaroni stay the same when cooked just become softer and edible.

Kp/Kc = RT

Given

Reaction

A(g) ⇌ C(g)+B(g)

Required

Kp/Kc

Solution

For reaction :

pA + qB ⇒ mC + nD  

[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]

While the equilibrium constant Kp is based on the partial pressure  

[tex]\large {\boxed {\bold {Kp ~ = ~ \frac {[pC] ^ m [pD] ^ n} {[pA] ^ p [pB] ^ q}}}}[/tex]

The value of Kp and Kc can be linked to the formula '  

[tex]\large {\boxed {\bold {Kp ~ = ~ Kc. (R.T) ^ {\Delta n}}}}[/tex]

R = gas constant = 0.0821 L.atm / mol.K  

Δn=moles products - moles reactants or

number of product coefficients-number of reactant coefficients  

For reaction :

A(g) ⇌ C(g)+B(g)

number of product coefficients = 1+1=2

number of reactant coefficients   = 1

Δn= 2 - 1 =1

So Kp/Kc = RT

Answer:

8.849 kilometres

Explanation:

this is the height in kilometers

Answer:

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Answer:

436.55841 grams.

Explanation:

The molecular formula for Iron(III) Iodide is FeI3. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Iodide, or 436.55841 grams.

You use the 1 / 436.55841 conversion rate. This is different for each element, according to the stoichiometry tables. Iron(II) oxide would be 2/3 of the 1/436.55841 conversion rate, that is, multiplying the fraction to denominator.

Answer:

A. catalyst.

Explanation:

Catalyst is something that causes things to decay. I think catalyst is the right answer from what i know from Miraculous Ladybug... Did you know the show was originally going to be an anime?

Answer:

B) Eating a antacid to calm your upset stomach.

Explanation:

Answer: Explain how the biogeochemical cycles are essential for life

Biogeochemical cycles are critical to the existence of life, transforming energy and matter into usable forms to support the functioning of ecosystems, as noted previously. ... Carbon is an essential element in the bodies of all living organisms and an essential source of energy for many organisms.

Answer: D

Explanation: I took the quiz! Module 04.06! Have a good day!

Answer: Water level remains same as there is no difference in concentration gradient.

Explanation: When concentration inside and outside of the cell membrane is the same, no transport takes place and the levels will remain the same.

Answer:

ion-dipole

Explanation:

Let us remember that the potassium cation is an ion, a positive ion to be precise.

There is a dipole existing in the hydrogen cyanide molecule. The positive end of the dipole is on hydrogen while the negative end of the dipole is on the cyanide moiety.

The only possible interaction between the potassium cation and the hydrogen cyanide is an ion dipole interaction. The cation interacts with the cyanide moiety having a partial negative charge in the molecule.

Answer:

UMMMMMMMMMMM

Explanation:

Answer:

3729

Explanation:

RT

by using relation between Kp and Kc we get the above answer

Answer:

Webbed Feet

Explanation:

Webbed Feet Benefits:

Most animals with webbed feet are aquatic animals who live in, on, or near the water. Webbed feet help them move quickly through the water when they're chasing food or trying to escape from predators.

Answer:

The voltage or potential difference

Explanation:

What makes current flow in a circuit is the voltage or the potential difference.

This force is supplied by the battery or the mains electrical circuit.

Answer:

3.51m/s

Explanation:

Given parameters:

Distance   = 20miles

         Miles to meters:

             1 mile  = 1609m

              20miles  = 20 x 1609  = 32180m

Time  = 153minutes

             1 min  = 60s

           153min  = 60 x 153  = 9180s

Unknown:

Average speed  = ?

Solution:

To solve this problem;

        Average speed  = [tex]\frac{distance }{time taken}[/tex]  

         Average speed  = [tex]\frac{32180}{9180}[/tex]   = 3.51m/s

Answer:

2Al + 6HCl -----> 2AlCl3 + 3H2

Reaction of acid with metals

Cu(OH)2. -----> H2O. + CuO

Dissociation of coper hydroxide / dissociation of base

Explanation: