Determine the number of grams of solute needed to make each of the following molal solutions.

Answer:

B

Explanation:

Chemical bonds are a form of potential energy.

9.46 J/g °C

Chemistry

Thermodynamics

Specific Heat Formula: q = mcΔT

Math

Pre-Algebra

Order of Operations: BPEMDAS

Equality Properties

Step 1: Define

Identify variables

[Given] m = 7.34 g

[Given] q = 923.5 J

[Given] ΔT = 54.7 °C - 41.4 °C = 13.3 °C

[Solve] c

Step 2: Solve for c

Step 3: Check

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

9.45966 J/g °C ≈ 9.46 J/g °C

Topic: AP Chemistry

Unit: Thermodynamics

Book: Pearson AP Chemistry

Answer:

Moles = avogadro's constant divided by the number of molecules.

Answer:

[tex]m_{FeCl_2}=0.652gFeCl_2[/tex]

Explanation:

Hello there!

In this case, according to the given information and the chemical reaction, whereby iron and hydrochloric acid react in a 1:2 mole ratio, it is firstly necessary to calculate the moles of iron (II) chloride from each reactant in order to figure out the limiting reactant:

[tex]n_{FeCl_2}=2.45gFe*\frac{1molFe}{55.845gFe}*\frac{1molFeCl_2}{1molFe}=0.0439molFeCl_2\\\\ n_{FeCl_2}=1.5L*0.25\frac{molHCl}{L} *\frac{1molHCl}{36.46gHCl}*\frac{1molFeCl_2}{2molHCl}=0.00514molFeCl_2[/tex]

In such a way, we infer the maximum moles of FeCl2 product are yielded by HCl, for which it is the limiting reactant. Finally, we calculate the grams of product by using its molar mass as shown below:

[tex]m_{FeCl_2}=0.00514molFeCl_2*\frac{126.75gFeCl_2}{1molFeCl_2} \\\\m_{FeCl_2}=0.652gFeCl_2[/tex]

Regards!

Answer:

38 and [Kr] 5s2.

Explanation:

The number of electrons and the electronic configurations are the same for the three isotopes of Strontium because in isotopes number of neutron increases not number of proton or electron. Isotope of element having the same atomic number but with different atomic masses due to increase the number of neutrons in each isotope. So the number of electron in all isotopes are the same i.e. 38 and the electronic configuration is also the same i.e. [Kr] 5s2.

Answer: The molarity of iodide ions in given solution is 0.181 M.

Explanation:

Given: Mass = 1.97 g

Volume = 34.2 mL (1 mL = 0.001 L) = 0.0342 L

Molar mass of [tex]ZnI_{2}[/tex] = 319.22 g/mol

Moles is the mass of substance divided by its molar mass. Hence, moles of [tex]ZnI_{2}[/tex] are calculated as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{1.97 g}{319.22 g/mol}\\= 0.0062 mol[/tex]

Molarity is the number of moles of a substance present in liter of a solution.

So, molarity of given solution is calculated as follows.

[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.0062 mol}{0.0342 L}\\= 0.181 M[/tex]

Thus, we can conclude that molarity of iodide ions in given solution is 0.181 M.

Answer:

hope this helps

Explanation:

2.  Well, we take the quotient...concentration=moles of solutevolume of solution

Explanation:

And thus concentration has the units of mol⋅L−1...

And so in this given scenario, the quotient gives....

concentration=[NaCl(aq)]=0.50⋅mol0.30⋅L=1.67⋅mol⋅L−1.

What are the concentrations with respect to [Na+], and [Cl−]?  

3. molarity=2.41molL

Explanation:

Molarity=Moles of soluteLiters of solution

Moles=0.289

Solution=120mL=0.12L

Therefore,

Molarity=0.289mol0.12L≈2.41molL

4. 1.169 mol/L

Explanation:

From the question given, we obtained the following information:

Volume = 0.075 L

Mole of CuCo = 0.0877 moles

Molarity =..?

Molarity is simply defined as the mole of solute per unit litre of the solution. It is represented mathematically as:

Molarity = mole /Volume

With the above formula, we can obtain the molarity of the solution as follow:

Molarity = 0.0877 mol / 0.075 L

Molarity = 1.169 mol/L

Therefore, the molarity of the solution is 1.169 mol/L

Answer:

The correct answer is - 15 hours.

Explanation:

Half-life an element is the time required to decay the half amount of the initial amount of the element and is represented by t1/2.

The formula for the calculating initial amount

n(i)=n(r)⋅2^n

where

n(i) - the initial number of moles of element

n(r) - the number of moles remained amount after the given time

n - the number of periods,

=  time T, where T is the half-life.

n(i)=n(r)⋅2^n

n(i)/n(r) =2^n

1/16 =2^n

n= 4

The half life = 60/n

= 60/4

= 15 hours.

Answer:

1.29

Explanation:

You have to find the equation which is d=m/v. d is 9.43=12.2/v. You have to solve for v which you get 1.29

1.29 [tex]cm^3[/tex] is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

Density is the measurement of how tightly a material is packed together.

Density =Mass ÷ volume

9.43=12.2 ÷  V

V = 1.29 [tex]cm^3[/tex]

Hence, 1.29 [tex]cm^3[/tex] is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

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Answer:

False

Explanation:

Frogs dont and i looked it up :)

Answer:

False

Explanation

Frog do not.

Answer:

Cells need to divide to reproduce.

Explanation:

They go through numerous stages, such as mitosis to further replicate themselves. They can't get things done alone, so they have to work in numbers.

Answer:

There are 2 types of forces, contact forces and act at a distance force. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.

Explanation:

Answer: Synthesis

Explanation:

Whenever two reactants react to form one product, it is a synthesis.

Answer:

The answer is in the explanation

Explanation:

The atomic weight of an element is defined as the mass of 1 mole of atoms of the element. To find the atomic weight of the first 30 elements we must see our periodic table:

#      Element       Atomic Weight

1       Hydrogen 1.008

2 Helium 4.0026

3 Lithium 6.94

4 Beryllium 9.0122

5 Boron 10.81

6 Carbon 12.011

7 Nitrogen 14.007

8 Oxygen 15.999

9 Fluorine 18.998

10 Neon 20.180

11 Sodium 22.990

12 Magnesium 24.305

13 Aluminium 26.982

14 Silicon 28.085

15 Phosphorus 30.974

16 Sulfur 32.06

17 Chlorine 35.45

18 Argon 39.948

19 Potassium 39.098

20 Calcium 40.078

21 Scandium 44.956

22 Titanium 47.867

23 Vanadium 50.942

24 Chromium 51.996

25 Manganese 54.938

26 Iron 55.845

27 Cobalt 58.933

28 Nickel 58.693

29 Copper 63.546

30 Zinc 65.38

Answer:

energy for the body to work

Explanation:

Answer:

d

Explanation:

d

The formulas which could represent the empirical formula and the molecular formula of a given compound are  CH₂, C₃H₆ as the smallest possible is 2 which on multiplying the subscripts of empirical formula give molecular formula.

Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.

Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.

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Answer:

The starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

Explanation:

By using different chemcial reactions

Answer:

Color combinations are produced in the sky when various metal elements are heated, exciting electrons and releasing  excess energy in the form of light. The color you see is determined by the chemicals that burn at different wavelengths  of light in the spectrum. Higher energy compounds (e.g. copper chloride) emit colors like violet and blue and lower  energy compounds (e.g. strontium chloride) emit colors like orange and red.

Explanation:

Please mark brainiest ✌

Answer:

Solution given:

Required reaction is:

2H2+O2➔2H2O

now

10.

oxygen have 16 amu than total mass in the left side of oxygen is:

16×2=32 amu of Oxygen

11.

total mass of Oxygen in product side is;

16×2=32 amu of Oxygen

Answer: hello some part of your question is missing below is the missing part

when H₂O and H₂O₂ is added to Mn(OH)₂(s) and put in water bath to dissolve

answer : attached below

Explanation:

When Mn²⁺ ions are separated from the mixture, attached below are the requires reaction equations that shows the process of separation.

Mn²⁺ ions are separated to the right of the reaction  equations

Answer: H3PO4(aq)+3NaOH(aq)→Na3PO4(aq)+3H2O(l)

Explanation:

gravitational force is most responsible for binding together an atom’s protons and neutrons.

In physics, gravity (from Latin gravitas 'weight') is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is by far the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.

On Earth, gravity gives weight to physical objects, and the Moon's gravity causes tides in the oceans. Gravity also has many important biological functions, helping to guide the growth of plants through the process of gravitropism and influencing the circulation of fluids in multicellular organisms. Investigation into the effects of weightlessness has shown that gravity may play a role in immune system function and cell differentiation within the human body.

The gravitational attraction between the original gaseous matter in the Universe allowed it to coalesce and form stars which eventually condensed into galaxies, so gravity is responsible for many of the large-scale structures in the Universe. Gravity has an infinite range, although its effects become weaker as objects get farther away.

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Answer:

The answer is oxygen gas.

Answer:

The maximum wavelength of light for which a carbon-carbon single bond could be broken by absorbing a single photon is 349 nm.

Note: The question is incomplete. The complete question is given below:

It takes 348./kJmol to break a carbon-carbon single bond. Calculate the maximum wavelength of light for which a carbon-carbon single bond could be broken by absorbing a single photon.

Round your answer to 3 significant digits.

Explanation:

From the question, it takes 348 kJ/mol to break a carbon-carbon triple bond.

Thus, the energy required to break 1 mole of carbon-carbon triple bond = 348 kJ = 348,000 J/mol.

For a single carbon-carbon single bond, energy required is given as E.

E = Energy required per mol/number of atoms per mole, NA

NA = 6.02 × 10²³

E = 348000 J / 6.02 × 10²³ = 5.7 × 10-¹⁹ J

This energy will be equivalent to the wavelength of the photon of light absorbed by the atom.

From Planck's equation, E = hc/λ

Where c = velocity of light = 3.0 × 10⁸ m/s

h is Planck's constant = 6.63 × 10-³⁴ Js

λ is wavelength of photon

Making λ subject of the formula:

λ = hc/E

λ = (6.63 × 10-³⁴ Js × 3.0 × 10⁸ m/s)/5.7 × 10-¹⁹ J

λ = 3.49 × 10-⁷m = 349 nm

The maximum wavelength of light for which a carbon-carbon single bond could be broken by absorbing a single photon is 349 nm.