12. Calculate the molecular weight.
a. Sodium Chloride (NaCl)
b. Magnesium sulphate (MgSo.)​

Answers

Answer 1
NaCl molecular weight is 58.44 g/ mol

Related Questions

0.954 mol bromine is added to 1 L reaction vessel that contains 1.22 mole of hydrogen and 1 mole of HBr at 1500K. What is the partial pressure of hydrogen, bromine and HBr at equilibrium?

Answers

Answer:

Partial pressure of H₂ →  149.9 atm

Partial pressure of Br₂ → 117.2 atm

Partial pressure of HBr → 112.8 atm

Explanation:

The problem can be solved by the Ideal Gases Law.

In a mixture of gases we know that the sum of partial pressures values the total pressure in the vessel. And the total pressure in the vessel is generated by the total moles which are presennt.

Total moles = 0.954 moles + 1.22 moles + 1 mol = 3.174 moles

Let's apply the Law to determine the total pressure.

P . 1 L = 3.174 moles . 0.082 . 1500 K

P = 390.4 atm

Now we apply the mole fraction concept

Mole fraction (1) →  moles of gas / total moles

Mole fraction (2) → partial pressure of gas / total pressure

In conclussion 1 = 2

Partial pressure of H₂ →  (1.22 / 3.174) . 390.4 atm = 149.9 atm

Partial pressure of Br₂ → (0.954 / 3.174) . 390.4 atm = 117.2 atm

Partial pressure of HBr → (1 / 3.174) . 390.4 atm = 112.8 atm

A sample is found to contain 2.98x10^-10 g of salt. Express this quantity in nanograms.

Answers

This quantity = 0.298 nanograms(ng)

Further explanation

Mass is one of the principal quantities, which is related to the matter in the object

The main mass unit consists of 7 units of other than other units of mass such as quintals, tons, pounds, ounces:

Kilogram, kg

Hectogram, hg

Decagram, dag

gram, g

Desigram, with

centigram, cg

milligram, mg

Each unit descends then multiplied by 10, and if one unit increases then divided by 10

Conversion of other mass units:

10⁻³ g ⇒mg-milligrams

10³ g ⇒kg-kilograms

10⁻⁶ g ⇒µg-micrograms (mcg)

10⁶ g ⇒Mg-megagrams (tons)

10⁻⁹ g ⇒ng-nanograms

10⁹ g ⇒Gg-gigagram

10⁻¹² g ⇒pg-pikogram

2.98 x 10⁻¹⁰ g to nanograms(ng)

[tex]\tt 2.98\times 10^{-10}\times 10^9=0.298~ng[/tex]

Calculate the number of C atoms in 0.716 mole of C?

Answers

Answer:

The answer is 4.31 × 10²³ C atoms

Explanation:

The number of C atoms can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.716 × 6.02 × 10²³

We have the final answer as

4.31 × 10²³ C atoms

Hope this helps you

How does the number of atoms or molecules in a system affect its thermal energy?
A. A system with fewer atoms and molecules has more thermal energy.
B. A system with more atoms and molecules has more thermal energy.
C. The number of atoms or molecules does not affect the thermal energy of a system.
D. Thermal energy increases as the atoms and molecules in a system move more.

Answers

Answer:

D. Thermal energy increases as the atoms and molecules in a system move more.

Explanation:

Thermal energy is a form of kinetic energy possessed by molecules of a system. The measure of this kinetic energy in an atom is called heat.

The average kinetic energy of a system is the temperature.

According to the kinetic theory, the more the particles move, the more their thermal energy. Thermal energy is often predicated on the velocity of the particles of the medium.

what are 4 ways a mineral can form​

Answers

Answer:

The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic, in which new minerals form at the expense of earlier ones owing to the effects of changing—usually increasing—temperature or pressure or both on some existing rock type, and (4) hydrothermal, in which minerals are chemically precipitated from hot solutions within Earth.

The mineral can be formed from volcanic gases, oxidation, crystallization from magma, sediment formation, or deposition from a saline fluid.

What is a mineral?

A rock can be described as a collection of minerals. A rock that becomes so hot it melts and many minerals come out in liquids that are hot enough to melt rocks.

Magma can be defined as a melted rock inside Earth, a molten mixture of substances that can be hot to more than 1,000°C. When the magma cools slowly inside the earth, which provides mineral crystals time to grow large enough.

Granite is a rock that produces from slowly cooled magma, consisting of the minerals quartz, plagioclase feldspar which is shiny white, pink potassium feldspar, and black biotite.

When magma will erupt onto the surface of the Earth, it is known as lava. Lava cools more rapidly than magma when it is below the surface and mineral crystals do not have time to form. But the chemical composition remains the same as if the magma cooled slowly.

The mineral can be formed through hydrothermal processes, weathering, and metamorphic and igneous environments.

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8. Which object has molecules that are moving? water in a cup that is not moving, or water in the ocean
PLEASE HELP ASAP!!!

Answers

Answer:

Water in the ocean

Explanation:

The water in the ocean is always moving so all the molecules are was well

A geologist studies rocks. Which of Earth's spheres would a geologist be most interested in?​

Answers

Answer:

Lithosphere

Explanation:

Answer:

ether the crust or lithosphere

Explanation:

Please help. Will give brainliest.

Answers

Answer:

B.

Explanation:

i think its B

which of the following is an example of
a physical property?

Answers

Answer:

physical property is property that you can touch, smell as it is bumpy it smells like eggs.

Explanation:

YW

Answer:

Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.

Explanation:

limnetic, profundel, littoral, and benefitic have what in common

Answers

They refer to upper level zones found in salt- and freshwater ecosystems

Which element is the most similar to calcium ca

Answers

Answer:

strontium

Explanation:

Answer:

Strontium

Explanation:

This is a earth metal, calcium is a reactive metal that forms a dark oxide nitride layer when exposed to air.

very
Which of the
following mineral
characteristics are
associated with
gold?
A. it is a compound
B. it is made of many elements
C. it is man made
D. it is a solid

Answers

Answer:

D,B

Explanation:

there are 79 elements in gold

Europium orbital diagram

Answers

What are you talking about there’s no question

i need help ):

soo.. help me ! please (:

Answers

23 Sandwiches

Slices of cheese

6 slices of bread

0 slices of cheese

I think this is right.
Hope this helps :)

Answer:

23 Sandwiches

6 slices of bread

0 slices of cheese

Explanation:

brainliest pls:)

When sodium atoms (Na) and chlorine atoms (CI) join to make

Answers

Answer: Potassium and fluorine

Explanation:

The two rows form bonds the easiest

Answer: #1

Explanation:

How many mL (to the nearest mL) of 0.140-M KF solution should be added to 400. mL of 0.212-M HF to prepare a pH

Answers

Answer:

205mL of 0.140M KF solution

Explanation:

pH = 2.70 solution.

It is possible to obtain the pH of the buffer of HF-KF using the H-H equation:

pH = pKa + log [KF] / [HF]

Where pH is desire pH = 2.70

pKa is pKa of HF = 3.17

[KF] could be taken as moles of KF

And [HF] moles of HF: 400.0mL = 0.4L * (0.212mol/L) = 0.0848 moles of HF

Replacing:

2.70 = 3.17 + log [KF] / [0.0848 moles HF]

-0.47 = log [KF] / [0.0848 moles HF]

0.3388 = [KF] / [0.0848 moles HF]

[KF] = 0.02873 moles of KF must be added.

In mL using concentration of KF (0.140M):

0.02873 moles KF * (1L / 0.140 mol) = 0.205L =

205mL of 0.140M KF solution

HEEEELLLPPPP PLEASE I WILL MARK BRAINLIEST

Answers

try going to the google app. i don’t know how long it will take for someone to answer this right so you could do that. just make sure when u scan it, that it’s on homework.

A binding protein binds to a ligand L with a Kd of 400 nM. What is the concentration of ligand when Y is (a) 0.25, (b) 0.6, (c) 0.95?

Answers: (a) 133.33nm (b) 600nm (c) 7,600nm

Answers above are correct. Please show all steps, really trying to understand.

Answers

Answer:

(a) 133.33nm

(b) 600nm

(c) 7,600nm

Explanation:

The concentration of Y can be determined by using the formula:

[tex]Y = \dfrac{[L]}{k_d+[L]}[/tex]

where;

[L] = concentration of the binding ligand.

kd = 400 nm

Thus:

When Y = 0.25; we get :

[tex]0.25 = \dfrac{[L]}{400+[L]}[/tex]

0.25 (400 + [L]) = [L]

100 + 0.25[L] = [L]

100 = [L] - 0.25 [L]

100 = 0.75 [L]

[L] = 100/0.75

[L] = 133.33 nm

At, Y = 0.6

[tex]0.6 = \dfrac{[L]}{400+[L]}[/tex]

0.6 (400 + [L]) = [L]

240 + 0.6[L] = [L]

240 = [L] - 0.6 [L]

240 = 0.4 [L]

[L] = 240/0.4

[L] = 600 nm

At, Y = 0.95

[tex]0.95 = \dfrac{[L]}{400+[L]}[/tex]

0.95 (400 + [L]) = [L]

380 + 0.95[L] = [L]

380 = [L] - 0.95 [L]

380 = 0.05 [L]

[L] = 380/0.05

[L] = 7600 nm

Suppose that you are a scientist who studies climate changes. While examining the rings of tree trunks, you notice several very large tree rings. What can you conclude about the climate during those years?

Answers

Answer:

The climate was wet and cold

Explanation:

Answer:

The large tree rings allow you to conclude that the climate was either very warm or wet during those growing seasons, because greater than normal growth occurred.

Explanation: It is the edge sample response

Mineral reaction to stress​

Answers

Answer:

Tenacity describes the reaction of a mineral to stress such as crushing, bending, breaking, or tearing. ... The majority of all minerals are brittle. An example is Quartz. (Minerals that are not brittle may be referred to as Nonbrittle minerals.)

Why aren't the masses on the periodic table whole numbers?

Answers

The masses on the periodic table aren’t whole numbers because they are the average masses of each of the element’s natural isotopes. Basically, the number comes from multiplying each isotope’s mass with its natural abundance (a percentage) and then adding each of those numbers up.

the earth is 24,901 miles. how many hours would it take to travel around the earth if traveling 100 meters per second?

Answers

Answer:

24,901 x 1609.34 = 40074275

40074275/100 equals

400742.75 s

divided by 3600

111.31

Explanation:

Please help I beg you

Answers

Answer:

is highly respect is correct I promise!

What are the oxidation numbers of the atoms in this reaction?

Check all that apply.

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

0 for Mg in Mg and MgCl2

0 for Mg(s) and H in H2

+1 for H in HCl

-1 for Cl in HCl

+2 for Mg in MgCl2

Answers

Answer:

2-5

Explanation:

I just did it.

The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

What is oxidation number?

An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.

Oxidation state or number helps us describe the transfer of electrons.

The oxidation number/state is also used to determine the changes that occur in redox reactions.

Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.

Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

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what do y'all girls find attractive on a guy?

Answers

Answer:

alot of things

Explanation:

Calculate the mass percentage of NaClNaCl in a solution containing 1.50 gg of NaClNaCl in 50.0 gg of water.

Answers

Answer:

%m/m = 2.9 %

Explanation:

The mass percentage (m/m %) of a solution is calculated as follows:

m/m % = mass of solute/ mass of solution x 100

The solution is composed by : solute + solvent. In this case, the solute is NaCl and the solvent is water. We have:

mass of solute = 1.50 g

mass of solvent = 50.0 g

mass of solution = mass of solute + mass of solvent = 1.50 g = 50.0 g = 51.5 g

Thus, the mass percentage of NaCl in the solution is :

% m/m = (1.50 g)/(51.5 g) x 100 = 2.91 % ≅ 2.9 %

Question 1 (1 point)
A chemical reaction is when substances are changed into other substances.

True or False

Answers

the answer to that is: F A L SE

11) Nitrogen oxides undergo many interesting reactions in the environment and in industry. Given the following information, calculate H for the overall equation:
2 NO2(g) + 1/2 O2(g) N2O5(s).
N2O5(s) 2 NO(g) + 3/2 O2(g), deltaH = 223.7 kJ

NO2(g) NO(g) + 1/2 O2(g), delataH = 57.1 kJ

delataH = ______kJ

12))))Write all coefficients, even if they are fractions or 1.)
(a) (Apply fractions as needed.)
______ _____(s) + ______ ______ (g) 5 NaCl(s)
(b) (Use the lowest possible coefficients.)
_______ _____ (s) + ______ _____(g) _____CaCl2(s)
(c) (Apply fractions as needed.)
_____ _____(g) _____O3(g)
(d) (Apply fractions as needed.)
______Mg(s) + _____ ______(s) + _____ ____(g) _____Mg3(PO4)2(s)

Answers

Answer:

one more time

Explanation:

shpuld i go

In an aqueous solution, a 0.100 M solution of glucose is prepared with a total volume of 0.150 Liters. If the molar mass of glucose is 180.16 g/mol how many grams must the solution contain?

Answers

Answer:

2.70 g of glucose.

Explanation:

The following data were obtained from the question:

Molarity of the glucose solution = 0.1 M

Volume of solution = 0.15 L

Molar mass of glucose = 180.16 g/mol

Mass of glucose =.?

Next, we shall determine the number of mole of glucose in the solution. This can be obtained as follow:

Molarity of the glucose solution = 0.1 M

Volume of solution = 0.15 L

Mole glucose =?

Molarity = mole /Volume

0.1 = Mole of glucose /0.15

Cross multiply

Mole of glucose = 0.1 × 0.15

Mole of glucose = 0.015 mole

Finally, we shall determine the mass of glucose in the solution as follow:

Mole of glucose = 0.015 mole

Molar mass of glucose = 180.16 g/mol

Mass of glucose =.?

Mole = mass /molar mass

0.015 = mass of glucose /180.16

Cross multiply

Mass of glucose = 0.015 × 180.16

Mass of glucose = 2.70 g

Therefore, the solution contains 2.70 g of glucose.

The grams that the solution must contain is :

- 2.70 g of glucose.

Mole Concept

Given:

Molarity of the glucose solution = 0.1 M

Volume of solution = 0.15 L

Molar mass of glucose = 180.16 g/mole

Molarity of the glucose solution = 0.1 M

Volume of solution = 0.15 L

Molarity = mole /Volume

0.1 = Mole of glucose /0.15

Mole of glucose = 0.1 × 0.15

Mole of glucose = 0.015 mole

Mole of glucose = 0.015 mole

Molar mass of glucose = 180.16 g/mol

Mass of glucose =.?

Mole = mass /molar mass

0.015 = mass of glucose /180.16

Mass of glucose = 0.015 × 180.16

Mass of glucose = 2.70 g

The solution contains 2.70 g of glucose.

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The Venmo diagram compares protons with electrons. Which shared property belongs in the region marked B?

Answers

Protons and Electrons have one thing in common is electrically charged.
Answer D
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