Moles are made up of melanocytes. Which are located on the outer layer of skin. Different people have different color moles, an African-American could have a pink mole, and on the other hand (get it other hand hehehe) a Pacific Islander could have a really dark brown mole. Sometimes,a cluster of melanocytes forms and they form a ,yup you guessed it ,a mole! It is important to get checked for skin cancer if you have a series of moles or freckles pop up in a short period of time. Any race can get skin cancer, so wear sunscreen!Always wear sunsreen!

Depending on your experiment, the number of moles will or will not change. If the gas is in a sealed container, then obviously the number of moles does not change. But if the gas is in an open container, then the gas is free to move.

In this case, raising the temperature would cause the number of moles to go down. Because the temperature is going up, the pressure increases also. When the pressure goes up, the volume goes up, meaning the gas "wants" to spread out. In an unsealed container, the gas will leave and you will end up with less moles within the container.

The molar mass of oxygen is 32 g.
1,2 mg oxygen is equal to 0,0000375 moles.

Shove a dick in it

5 mole copper (6.022 X 1023/1 mole Cu)

= 3 X 1024 atoms of copper

-----------------------------------

100 grams

To determine the mass of Iron, its density is required. The formula used is Volume x Density = Mass. Assuming the Iron is pure and in solid state with a density of approximately 7.87g/cm3 at room temperature, its mass is around 51.2g.

The name diphosphorus pentoxide indicates that there are (exactly) five oxygen atoms in each molecule. Therefore, 3.45 mol contains 17.25 mol of oxygen atoms. However, at standard temperature and pressure, oxygen exists in the form of divalent molecules. Therefore, if the question pertains to oxygen under such conditions, the correct answer is 8.62 mol, to the justified number of significant digits.

mol = mass/Mr

If the Mr and number of moles of a substance is known then the mass can be calculated.

example:-

if we have 1 mole of Na, how many grams do we have?

mass = mol x Mr

mass = 1 x 23

mass = 23g

.49 ATM

The same as the molecular weight of the compound.

I just thought it was 1.48 g/cm3 because that is the density of a chloroplast. Hope this helps.

The density of nitrogen is 1,2504 g/L.
The density of air is 1,2922 g/L.
Both values are at 20 oC.

The molecular weight (or, more appropriately, the molar mass) is defined by # of grams per # of moles.

MW = g / mol

For example: if you have 4 grams of substance and you know the substance to be 2 moles (say, for example, the balanced chemical equation), then your MW would be 2.

The atomic mass of chlorine is 35.5. A chlorine molecule has two chlorine atoms. Therefore its molecular mass is 71u.

The number of molecules in 1 mole is avogadros number, 6.022 X 1023. So in o.5 mole ter would be 3.011 X 1023

For H2 N2 O2 CI2 F2 I2 We find in the nature as diatomic-molecular form. So we need to multiply by two their molar mass. 1 mol of hydrogen is 1x2= 2 gram; 0.5 mol of H2 is 1 gram.

Suppose you have 1g of H2O and you want to convert that to moles. You multiply 1g by the inverse of molar mass to get the moles of H2O: 1g H2O *(1mol H2O/18g H2O)= 0.56 moles of H2O in 1g of H2O. You get 18g = 2(1.008)+1(16.00).

The ammonium ion has one nitrogen atom and four hydrogen atoms. Their atomic masses are 14 and 1 respectively. Therefore the RMM of the ammonium ion s 14+4x1=18.

Since potassium chloride has the formula KCl and the mass of the lost electron from neutral potassium is negligible compared with the mass of the protons and neutrons in the potassium atom nucleus, the molecular mass of potassium in this compound is the same as the atomic mass of potassium, 39.098.

When it has no other gasses mixed with it. For example, we breathe oxygen, but we do not breathe pure oxygen because it is mixed with nitrogen.

1 mol is equal to 6.02214179(30)×1023 molecules of the substance.

The molecular weight is how much grams these molecules (6.02214179(30)×1023) weigh. Meaning g/mol.

The molarity is a form of expression for the concentration; the molarity of a solution is the number of moles of solute in the solvent. The number of moles is the ratio between the mass of the solute in the solution and and its molar mass.