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Why do we use the mole as a unit of measurement for counting atoms?
The mole is used as a unit of measurement for counting atoms because it allows us to work with a convenient and consistent quantity of atoms. One mole of any substance contains the same number of atoms, which is approximately 6.022 x 1023. This large number makes it easier to work with extremely small particles like atoms and molecules in chemical reactions and calculations.
How many atoms are in 4Na plus O2 2Na2O show your work?
There are a total of 8 atoms in the chemical equation 4Na + O2 → 2Na2O. This can be calculated by adding up the number of atoms on both sides of the equation: 4 sodium atoms from 4Na, 2 oxygen atoms from O2, and 2 oxygen atoms from 2Na2O. Thus, the total number of atoms is 4 + 2 + 2 = 8 atoms.
How do you calculate the atomic weight of a metal using its atomic radius and density?
Given the density, you can find the volume per mole of metal by taking dividing the molarity by the density. Using this, you can find the volume of a mole of atoms (this is a different value) by multiplying to the volume per mole of the metal by the packing efficiency. Next, divide the volume of a mole of atoms by the Avagadro's number. Then, using the volume of a sphere, you can find the radius. Here's a better explanation using formulas: Volume per mole of metal = Molarity/Density Volume per mole of atoms = (Volume per mole of metal) x (Packing Efficiency) Volume of 1 atom = Volume per mole of atoms/6.022 x 1023 Volume of 1 atom = (4/3) x pi x radius3
Estimate the number of gold atoms in a gold coin with a diameter of 1 cm and a thickness of 1mm?
A gold coin with a diameter of 1 centimeter and a 1 mm thickness has a volume of .07854 cubic centimeters. Gold has a density of 19.30 grams per cubic centimeter. There is 1.5158 grams of gold or 7.7 millimoles or 4.637 E21 atoms.
How do you work out how many electrons in an atom?
The number of electrons in an atom is equal to the number of protons in the nucleus, which is the atomic number of the element. You can find the atomic number on the periodic table. For atoms that are neutral, the number of electrons is also equal to the number of protons.
What two quantitiesdo you need know in order to calculate density?
If you don't know this you can work it out from the units: Density = kg/m^3 (kilograms per metre cubed) Mass is measured in kilograms Volume is measured in metres cubed You therefore need mass and volume to work out density.
A granite sculpture weighs 5.4 kilograms and has a volume of 2000cm cubed work out the density of granite give your answer in grams per cm cubed?
density = mass / volume So first 5.4 kg = 5400 g since we need our answer in grams/cm cubed. Now 5400/2000 = 2.7 g/cm3
How many atoms in 19.3 grams of gold on a sheet that is 0.00010?
To calculate the number of atoms in 19.3 grams of gold, you need to first determine the number of moles of gold. Then, you can use Avogadro's number (6.022 x 10^23) to find the number of atoms. Given that the sheet is only 0.00010 cm thick and the density of gold is 19.3 g/cm^3, you can determine the area of the sheet and then calculate the number of atoms.
How do you work out 5 cubed?
times the number you are by itself five times for example 25= 2x2x2x2x2=64
How do cubic numbers work?
A cubed number just means the is multiplied by itself 3 times. 23= 2*2*2=8 If it's a variable cubed then just add and subtract as if it didn't have the cube, but ONLY if the other number is that same number cubed. 2x3+5x3=7x3 because 2+5=7
How do you work out the mass of a cylinder?
Area of cylinder base = pi x Radius squared (πr2) Radius is in centimeters (cm) Area is in centimeters squared (cm2) ---- Volume = Area x Height Area is in centimeters squared (cm2) Height is in centimeters (cm) Volume is in centimeters cubed (cm3) ---- Mass = Volume x Density Density is in grams centimeter cubed (g/cm3) Volume is in centimeters cubed (cm3) Mass is in grams (g)
How do you work out 15 cubed?
15 cubed means 15 times itself three times (15x15x15). 15 cubed is equal to 3,375.
What is the density of an unknown substance if the mass is 5.0 and the volume is 1.5?
see density is simply the number of particles(atoms,molecules) in a unit space(volume).The greater the no of particles in an area the greater the density. The formula of density can be denoted as-mass/volume which in your case is->m=5 units & v=1.5 units so if you can work this out - 5/1.5 unit you'll get the ans(3.333.....)
How do you work out an atoms atomic number by looking at its electronic structure?
Count the total number of electrons.
How do you you work out the number of neutrons in an atom?
Atomic Mass minus atomic number
Can you show work finding density with a mass of 155 pounds and volume of 4.2 ft cubed?
To find density, use the formula Density = Mass/Volume. Convert mass of 155 pounds to kg by dividing by 2.205 (1 kg = 2.205 pounds). Therefore, 155 pounds = 70.31 kg. Next, divide the mass by the volume (70.31 kg / 4.2 ft^3) to find the density. The density is approximately 16.74 kg/ft^3.
What is a unique subtance composed of atoms having the same atomic number?
A element is a unique substance that is composed of atoms having the same atomic number. Energy is the ability to do work.
