A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molar masses, list the GFM of each substance.

Answer:

7mL of sterile water is the initial amount of the concentrated solution is 3mL

Explanation:

In this problem, the vial must be diluted from 5mg/mL to 1.5mg/mL, that means the solution must be diluted:

5mg/mL / 1.5mg/mL = 3.33 times

If the initial amount of the drug in the vial is 3mL, the final volume must be:

10mL

That means the volume of water that should be added is:

10mL - 3mL:

Answer:

I think the answer is b

Explanation:

the paragraph states, that it is an experiment to see if there is any oxygen in the water

Answer:

The number of electron in neutral atom of nitrogen are 7.

Atomic mass = 14 amu

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

The number of electron in neutral atom of nitrogen are 7.

Thus its atomic number is also 7.

Atomic mass = number of proton + number of neutron

Atomic mass = 7 + 7

Atomic mass = 14 amu

Answer:

Explanation:

This image is a good example of the law of conservation of mass because it shows that mass is not created or destroyed. We can see this in the picture because there's 4 hydrgen and 2 oxygen atoms in the reactants (the left side of the arrow) and there's 2 oxygen atoms and 4 hydrogen atoms in the products (right side of the arrow). Since there's the same amount of atoms on both sides, then law of conservation of mass applies.

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Hope this helped.

Answer:

hope you like my answer

Explanation:

this is the answer

Answer:

[tex]M_{C_9H_{13}NO_3}=183.23g/mol[/tex]

Explanation:

Hello!

In this case, since the molar mass of a chemical compound is computed by averaging the atomic mass of each element in the molecule and the amount of atoms; which in this case there are 9 carbon atoms, 13 hydrogen atoms, 1 nitrogen atom and 3 oxygen atoms; thus, we compute the average as shown below:

[tex]M_{C_9H_{13}NO_3}=m_C*9+m_H*13+m_N+m_O*3[/tex]

Now, we plug in the atomic masses to obtain:

[tex]M_{C_9H_{13}NO_3}=12.01*9+1.01*13+14.01+16.00*3\\\\M_{C_9H_{13}NO_3}=183.23g/mol[/tex]

Best regards!

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

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

[tex]n = \frac{4.816 \times {10}^{24} }{6.02 \times {10}^{23} } = 8 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

there are 8 moles.

Answer:

mass of silver chloride (AgCl) = 3.0135  grams

Explanation:

The chemical equation is:

[tex]AgNO_{3(aq)} + NaCl_{(aq)} \to AgCl_{(s)} + NaNo_3_{aq)}[/tex]

No. of mole  = molarity × volume

For AgNO3:

No. of moles = 1.00 × 0.055

= 0.055 moles

No. of moles of NaCl = 0.84 × 0.025

= 0.021 moles

From the equation:

[tex]1 \ mol e \ of \ AgNO_3 \ react \ with \ 1 \ mole \ o f \ NaCl[/tex]

Therefore, 0.055 moles of AgNO3 react with 0.055 moles of NaCl

Here;

NaCl serves as the limiting reactant

Thus,

1 mole of NaCl will react with AgNO3 to yield 1 mole of AgCl

∴

0.021 moles of NaCl react with AgNO3 to yield 0.021 moles og AgCl

mass of AgCl = no of moles × molar mass

= 0.021 × 143.5

= 3.0135  grams

6.68 g MgSO₄

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Aqueous Solutions

Atomic Structure

Step 1: Define

0.965 L

0.0575 M

Step 2: Identify Conversions

Molar Mass of Mg - 24.31 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of MgSO₄ - 24.31 + 32.07 + 4(16.00) = 120.38 g/mol

Step 3: Find MgSO₄

Step 4: Convert

[tex]\displaystyle 0.055488 \ mol \ MgSO_4(\frac{120.38 \ g \ MgSO_4}{1 \ mol \ MgSO_4} )[/tex] = 6.67959 g MgSO₄

Step 5: Check

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

6.67959 g MgSO₄ ≈ 6.68 g MgSO₄

Answer:

38 moles of oxygen

Explanation:

This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining): Ni(CO)₄. A chemical engineer has determined by measurements that there are 9.6 moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?

Step 1: Given data

Chemical formula of nickel tetracarbonyl: Ni(CO)₄

Moles of nickel: 9.6 moles

Step 2: Establish the molar ratio of nickel to oxygen

According to the chemical formula, the molar ratio of nickel to oxygen is 1:4.

Step 3: Calculate the moles of oxygen that accompany 9.6 moles of nickel.

We will use the previously established molar ratio.

9.6 mol Ni × (4 mol O/1 mol Ni) = 38 mol O

Answer:

rare username has joined the meeting.

Explanation:

Answer:

[tex]f=2x10^8Hz[/tex]

Explanation:

Hello!

In this case, given that frequency of the electromagnetic radiation showing off a wavelength of 1.25 m is computed by using the speed of light as shown below:

[tex]f=\frac{c}{\lambda }[/tex]

We plug in the wavelength and speed of light to obtain:

[tex]f=\frac{3x10^8m/s}{1.25m } \\\\f=2x10^8Hz[/tex]

Best regards!

The frequency will be "[tex]2\times 10^8 \ Hz[/tex]".

Radiation which thus travels throughout waves as well as which has both electromagnetic energy.

The power of electromagnetic radiation could range from minimum to maximum. Radio waves, radiation, x-rays, and gamma radiation are all examples of electromagnetic radiation.

Given value:

Wavelength, [tex]\lambda = 1.25 \ m[/tex]

Speed of light, [tex]c = 3\times 10^8[/tex] m/s

The frequency be:

→ [tex]f = \frac{c}{v}[/tex]

By putting the values,

     [tex]= \frac{3\times 10^8}{1.25}[/tex]

     [tex]= 2\times 10^8[/tex] Hz

Thus the above response is right.

Find out more information about wavelength here:

https://brainly.com/question/10728818

Answer:

a change from a solid to a liquid

Explanation:

Answer:

Dissolving salt in water is a chemical change.

Explanation:

A log burning is a chemical reaction, but not change. All the others are obviously not the answer.

Answer:B. One that occurs on its own

Explanation:

Answer: 5.4

Explanation: The Law of Impenetrability says that two objects can't occupy the same space at the same time; therefore, the pennies and the water can't occupy the same space at the same time. Without the pennies the water level read 20.6 mL, dropping in the pennies gives a level of 26.0.

A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Volume in mL of the stack of 15 pennies is  26.0 mL.

A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Although there are many different units that may be used to indicate volume, the most common ones are litres, m³, gallons, milliliters, teaspoon, as well as ounces.

Due to the Law of Impenetrability, which states that two items cannot occupy the same place at the same time, neither can pennies nor water. When the pennies are added, the water level rises to 26.0 mL from 20.6 mL before.

Mass is the quantity of matter a material contains, whereas volume is indeed the space that it occupies. The density of a sample is the quantity of mass in a given volume.

Therefore, volume in mL of the stack of 15 pennies is  26.0 mL.

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https://brainly.com/question/23477586

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Answer:

its A!! i just got finished my assignment and went straight on here because the other person didn't answer right. Trust me,its right!! good luck people<3

Explanation:

Answer:

Both liquids and gases are fluids

Explanation:

fluids are substances that flow, and gases also flow.

Answer:

reduce friction

Explanation:

Lubricants are needed to reduce the friction between two bodies in contact with one another.

Frictional force is a force that opposes the motion of a body. As a body moves forward, friction acts in an opposite direction.

Answer:

iii) An anion is a positive ion.

cuz an anion is negatively charged ion

The INCORRECT statement is "An anion is a positive ion".

So, the correct option is iii.

An atom can lose and gain one or more electrons from outermost shell which is known valence shell and formed an ions.

An atom gain one or more electrons and form negative charged species called an anion.

To learn more about an anion here.

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Answer:

125.4 kilopascals

Explanation:

wkdje

Answer:

125,400 pa = 125.4 kPa

Explanation:

1 pa = 0.001 kPa

&

1 kPa = 1,000 pa

Answer:

Tsunamis are usually triggered by earthquakes, volcanic eruptions and underwater explosions, landslides and other mass movements. Underseas earthquakes have generated nearly all the major tsunamis in history. Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water.

Explanation:

Answer A is correct because of the fact that tsunamis can be caused by underwater explosions

The best description that shows the relationship between earthquake and tsunami is an underwater earthquake can cause a tsunami.

The correct option is (A).

Tsunamis are waves that form when the ocean surface moves suddenly due to earthquakes.

Some other causes of tsunami are landslides on the sea floor land collapsing into the water, massive volcanic eruptions, or a meteorite strike in the ocean.

The displacement or collision of tectonic plates of earth lithosphere causes earthquake.

The earthquake in the sea or ocean surface leads to tsunami.

Thus, option (A) An underwater earthquake can cause a tsunami is the correct option.

Learn more about tsunami, here:

https://brainly.com/question/1126317

Answer:

2.35

Explanation:

A 1.00-L flask was filled with 2.00 moles of gaseous SO₂ and 2.00 moles of gaseous NO₂ and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous NO was present. Assume that the reaction

SO₂ + NO₂ ⇌ SO₃ + NO

occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.

Step 1: Calculate the molar concentrations

Since the reaction takes place in a 1.00 L flask, the molar concentrations are:

[SO₂]i = 2.00 M

[NO₂]i = 2.00 M

[NO]eq = 1.21 M

Step 2: Make an ICE chart

        SO₂ + NO₂ ⇌ SO₃ + NO

I       2.00   2.00       0        0

C        -x       -x         +x       +x

E    2.00-x  2.00-x    x         x

Step 3: Calculate the concentrations at equilibrium

The concentration of NO at equilibrium is 1.21 M. Then, x = 1.21.

[SO₂]eq = 2.00-1.21 = 0.79 M

[NO₂]eq = 2.00-1.21 = 0.79 M

[SO₃]eq = x = 1.21 M

[NO]eq = x = 1.21 M

Step 4: Calculate the value of the equilibrium constant, K, for this reaction

K = [SO₃] × [NO]/[SO₂] × [NO₂]

K = 1.21²/0.79² = 2.35

The micromoles of mercury(II) iodide : 0.013 μ moles

Given

215.0mL of a 6.0x10⁻⁵mmol/L HgI₂

Required

micromoles of HgI₂

Solution

Molarity(M) = moles of solute per liters of solution

Can be formulated :

M = n : V

n = moles

V = volume of solution

V = 215 mL = 0.215 L

so moles of solution :

n = M x V

n = 6.10 mmol/L x 0.215 L

n = 1.312 . 10⁻⁵ mmol

mmol = 10³ micromol

so 1.312 mmol = 1.312.10⁻⁵ x 10³ = 0.01312 micromoles ⇒ 2 sif fig = 0.013 μ moles

Answer:

Question: What Is The Correct IUPAC Name For S2F8? X ( ( (I) (IV) Di- Mono- Penta- Tetra- Tri- Hepta- Octa- Hexa- Fluorine Selenide Flourate Sulfide Sodium Sulfate Sulfur Fluoride Hydrate Acid.

Answer:

we use atom in our sentences all the time

Explanation:

that what i put

Answer:

2450 mg

Explanation:

From the given information:

The total weight of the capsule = 12.5 mg + 37.5 mg

= 50 mg

The percentage of drug in each capsule = [tex]\dfrac{12.5}{50} \times 100[/tex]

= 25%

= 0.25

To make 0.5 mg of drug in each  100 mg of powder after dilution;

Then, the drug percent in each capsule after dilution is:

[tex]=\dfrac{0.5}{100}\times 100[/tex]

= 0.5%

= 0.005

Suppose (p) mg represent the amount that is added to the diluent in the given capsule. Then;

The total amount is = (50 + p) mg

Since the amount of the drug = 12.5 mg

Then the concentration  [tex]=\dfrac{12.5}{50 + x}[/tex] which needs to be equal to the needed concentration that is diluted.

i.e.

[tex]\dfrac{12.5}{50 + x} = 0.005[/tex]

By cross multiply;

(50 + x) 0.005 = 12.5

(50 × 0.005) + (0.005x) = 12.5

0.25 + 0.005x = 12.5

0.005x = 12.5 - 0.25

0.005x = 12.25

x = 12.25 / 0.005

x = 2450 mg

Thus, there is a need for an additional 2450 mg to make a dilution that compass 0.5 mg of drug in 100 mg powder.

Answer:

d-multiply the mass of a mole by its molar mass

Explanation:

Mass of an element, Z, which is measured in grams is related to the number of moles contained in that element and its molar mass, which can be expressed using the formula:

number of moles (n) = mass ÷ molar mass

This means that the mass (in grams) can be calculated by multiplying the number of moles in the element by its molar/atomic mass. That is;

Mass (g) = number of moles (n) × molar mass (MM)

Answer:

wave

Explanation: