Molecular Mass

The question is missing something; I must assume that the compound is 23% N by mass and 77% O by mass. Starting with NO3 as an initial guess turns up 22.6% N, 77.4% O, which agrees with the above if we round off to two significant figures. It has a molar mass of 62, precisely half the stated molecular mass. One could presume a dimer of NO3, i.e., N2O6, which is hardly a common species but does appear in the literature.

620 grams mercury (1 mole Hg/200.6 grams)

= 3.09 moles Hg

n=m/M so, the atomic number for Phosphorus is 30.973... we divide the atomic number by the amount of grams we have so n= 2.3/ 30.973= 0.07425822490556

= 0.14 mol.

The answer is 1,594 mol.

58.1222 g/mol

They need a counting unit to count the number of atoms, molecules, or formula units of a substance.

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

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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.

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 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 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).

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.

29,0 g of calcium is equal to 0,723 moles.

Increasing the molecular mass of alkenes leads to stronger London dispersion forces between molecules, which requires more energy to overcome and results in a higher melting point. The larger and heavier molecules have more electron density, leading to a larger surface area for interaction between molecules, thereby increasing the strength of intermolecular forces.

using the formula: n=m/gfm

no. of moles=mass/gfm

you take the gram formula mass (gfm) as 4.

and given the mass is 16g, both numbers can be substituted into the formula...

n=16/4

= 4

the number of moles present in 16g of helium is 4 moles.

Diazepam or 7-chloro-1,3dihydro-1-methyl- 5-phenyl-2H- 1,4-benzodiazepin-2-one (IUPAC name) is an alkanone (ketone). Look at the end of the name, it ends in -one so its an alkanone.