Calculate the number of molecules in 8.4 g of NaOH

Answers

Answer 1

Answer: Molar mass NaOH = 40.0 g/mol

number of moles : 8.4 / 40.0 => 0.21 moles

1 mole ---------------- 6.02 x 10²³ molecules
0.21 moles ---------- ?

molecules : ( 0.21 ) x ( 6.02 x 10²³ ) / 1

= 1.264 x 10²³ molecules

hope this helps!

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What role does evidence play in repeating experiments?
Which list of elements contains a metal, a metalloid, a nonmetal, and a noble gas?(1) Be, Si, Cl, Kr (3) K, Fe, B, F(2) C, N, Ne, Ar (4) Na, Zn, As, Sb
Which of these elements has an electron configuration of [Kr]5s2?barium calcium rubidium strontium
A sample originally contained 1.28 g of a radioisotope. It now contains 1.12 g of its daughter isotope. How many half-lives have passed since the sample originally formed? 3 4 8 16

Explain the four quantum numbers

Answers

Principal (shell) quantum number - n

Describes the energy level in the atom (1 through 7)The maximum number of electrons in n is 2n2
2. Angular (subshell) quantum number - l
Describes the sublevel in nEach energy level has n sublevels
3. Magnetic quantum number - m
Describes the orbital within ls has 1 orbitalp has 3 orbitalsd has 5 orbitalsf has 7 orbitals
4. Spin quantum number - s
Describes the spin of the electrons in an orbital.Electrons in the same orbital must have oppisite spins.Possible spins are clockwise or counterclockwise.

What is an ion? Please, give an example.

Answers

an atom or molecule with a net electric charge due to the loss or gain of one or two electrons is known as ion .
ions are of two types
1. cations ( positive ion )
2. anion (negative ion )
for e.g Al³+

An Atom is electrically neutral with a charge equal to 0, because it have the same number of protons and electrons.
In ion is an atom who lose or gain electrons. When it lose an electron, the number of protons will be higher than then number of electrons in an normal atom, and will be called positive ion or cation.
Example: The Aluminium lose 3 electrons. So the ion of Al will be $Al^(3+)$ , and its charge is 3+
Ionization equation: $Al -----\ \textgreater \ Al^(3+) + 3^(e-)$
And When an ion gain electrons, the number of electrons will be higher than the number of protons in an normal atom, and will be called negative ion, or Anion..
Example: the Chloride gain 1 electron. So the ion of Cl is $Cl^(1-)$ , and its charge is 1-
Ionization equation: $Cl + 1^(e-) ----\ \textgreater \ Cl^(1-)$

HOPE THIS HELPS :D

A _____ is a new substance formed in a chemical reaction.A. coefficient

B. product

Answers

B. product
Think about it like this: a company produces products, not coefficients.

“The element vanadium is a solid at room temperature, and its density is 6110 kilograms per meter cubed. Its melting point is 1910 degrees Celsius.” Which correctly evaluates the statement? not reliable because opinions are presented, reliable because testable facts are presented, not reliable because it is very brief ,reliable because metric units are used

Answers

I think the correct answer is the second option. The statement pertaining to the properties of the element vanadium is reliable because the facts presented are testable or can be verified by doing experimentation. Also, nowadays, many studies are present that contains properties of almost anything.

Answer:

B: reliable because testable facts are presented

Explanation:

give the other guy brainliest he got here first

The average speed of a nitrogen molecule in air at 25 °C is 515 m/s. Convert this speed to miles per hour.

Answers

Answer:

1151.08miles/h

Explanation:

The given speed is 515 m/s

To convert meters per second to miles per hour:

Convert meters to miles: 1 m = 0.000621371 miles

Convert seconds to hours: 1 hr = 3600 s

Plug into the formula: miles/hr = (m/s) * (0.000621371 miles/m) * (3600 s/hr)

Plugging in the numbers: miles/hr = (515 m/s) * (0.000621371 miles/m) * (3600 s/hr) miles/hr = 1151.08miles/h

Therefore, the average speed of a nitrogen molecule in air at 25 °C converted to miles per hour is 1151.08miles/h.

Final answer:

To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, first convert the speed from meters per second to kilometers per hour, and then convert from kilometers per hour to miles per hour.

Explanation:

To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, we can use the conversion factor 1 mile = 1609.34 meters and 1 hour = 3600 seconds.

First, let's convert the speed from meters per second to kilometers per hour. We divide the speed in meters per second by 1000 to get the speed in kilometers per second and then multiply by 3600 to get the speed in kilometers per hour. This gives us a speed of approximately 1850 km/h.

Next, we convert the speed from kilometers per hour to miles per hour by dividing the speed in kilometers per hour by 1.60934. This gives us a speed of approximately 1150 mph.

Learn more about speed conversion here:

brainly.com/question/34421469

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Select the three types of cells in the blood.blue
red
black
white
platelets
round

Answers

Red white and plantelets hope it helps =)

Three selected types of cells in blood are Red White Round

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Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals?A) The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.B) The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.C) The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.D) The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

If you eat foods that are compact and _______, more can fit into your stomach with less discomfort.A. denseB. dryC. puffedD. tasty

An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21?(1) 1.04 s (3) 4.16 s(2) 2.08 s (4) 8.32 s