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This is not difficult if you remember the meaning of numbers in different positions. The correct format is Na2CO3.10H2O (sodium carbonate decahydrate). The subscripts multiply only the element immediately before them, and the 10 multiplies the whole water molecule. Thus we have:sodium, Na, 2 moles of atoms
carbon, C, 1 mole of atoms
oxygen, O 3 moles of atoms
water, H2O, 10 moles of molecules, i.e. 20 moles of hydrogen atoms, H, and 10 moles of oxygen atoms, O.
Collecting these we have 2 moles Na, I mole C, 13 moles O and 20 moles of H.
We find the formula mass by multiplying each element's number of moles by its mole mass and adding them all up:
r.f.m = 2 x 23 + 12 +13 x 16 + 20
= 286.
What else can I help you with?
Which of the following best describes how molecular mass and formula mass are related to the mass of a compound?
The formula mass of a compound is the mass in grams of Avogadro's number (6.0221415 × 1023) of molecules. For example NaCl (table salt) has a formula mass of 58.44277 (Na 22.9897, Cl 35.453) Avogadro's number of them weighs 58.44277 grams.
What is the formula mass for the ammonium ion?
The formula mass of the ammonium ion, NH4+, is calculated by adding the atomic masses of the elements in the formula. For NH4+, the atomic mass of nitrogen (N) is 14.01 and the atomic mass of hydrogen (H) is 1.01. Therefore, the formula mass is 14.01 + (4 x 1.01) = 18.05 g/mol.
The gram-formula mass of no2 is defined as the mass of?
The gram-formula mass of a compound is the sum of the atomic masses of all the atoms in a formula unit of the compound. For NO2, the gram-formula mass is calculated by adding the atomic mass of nitrogen (N) and two times the atomic mass of oxygen (O).
What is the relative formula mass of ethanol?
The relative formula mass of ethanol (C2H5OH) is 46 g/mol.
Determine the molecular formula of a compound if its empirical formula is C2H6O and its molar mass is 138g?
Because an empirical formula is the simplest form of a compound, we know that the molecular formula contains more atoms than it does. Since we are given the molar mass, we can use this formula. x ( MM of empirical formula ) = MM of molecular formula MM of empirical formula = 12(2) + 1(6) + 16 = 46 MM of molecular formula = 138 46x = 138 x= 138 / 46 x=3 Therefore, the molecular formula is 3(C2H6O) that is C6H18O3
What is the correct name of the compound Na2CO310H2O?
Sodium carbonate decahydrate
What is formula for mass?
There is no formula for mass. it is simply the weight measured in grams
What formula will be use to get average atomic mass on an isotopes?
mass formula
Mass Times Volume is a formula for what?
Mass times volume isn't a formula for anything. You may be confused with mass divided by volume, which is the formula for density.
What is the molecular formula of a compound with an empirical formula of C4H9 and a gram formula mass of 114 grams mole?
To determine the molecular formula from the empirical formula and gram formula mass, first calculate the empirical formula mass of C4H9 (4 carbons + 9 hydrogens). Then, divide the gram formula mass by the empirical formula mass to find the ratio. Finally, multiply the subscripts in the empirical formula by this ratio to get the molecular formula, which in this case is C8H18.
What is the formula of the formula mass?
Mass = weight /gravity Density = Mass / Volume So, if you know the density and the volume, you can calculate the mass. Also, you can measure the mass by measuring the weight. On earth, mass and weight are equal.
The formula mass of a molecule or an ion is?
The formula mass of a molecule or an ion is the sum of the atomic masses of all the atoms in the formula unit. This value is expressed in atomic mass units (amu) and is used to calculate the molar mass of the compound.
What is relationship between the formula weight of a substance and its molar mass?
Molar mass is the mass of particles in one mole of a substance. Molar mass is equal to atomic/ molecular/ formula mass in amu. Formula mass is in atomic mass unit while molar mass is in grams .
How does on determine a molecular formula from the empirical formula?
molar mass over grams of elementThe above answer is somewhat correct. In order to find the molecular formula when given the empirical formula, you must first find the molar mass of the empirical formula.MOLAR MASS# atoms element A x Atomic Mass element A (Periodic Table) = mass A# atoms element B x atomic mass element B (periodic table) = mass B... etc.Add up all of the mass values found above and you have the molar mass.Then, after you have found the empirical formula's molar mass, you divide the molar mass of the molecular formula by the empirical formula's molar mass (solving for n).MOLECULAR FORMULA EQUATION: N (Empirical formula) (read as N times empirical formula) where:N = Molar mass substance---- Molar Mass emp. form.
How does one determine a molecular formula from empirical formula?
molar mass over grams of elementThe above answer is somewhat correct. In order to find the molecular formula when given the empirical formula, you must first find the molar mass of the empirical formula.MOLAR MASS# atoms element A x Atomic Mass element A (Periodic Table) = mass A# atoms element B x atomic mass element B (periodic table) = mass B... etc.Add up all of the mass values found above and you have the molar mass.Then, after you have found the empirical formula's molar mass, you divide the molar mass of the molecular formula by the empirical formula's molar mass (solving for n).MOLECULAR FORMULA EQUATION: N (Empirical formula) (read as N times empirical formula) where:N = Molar mass substance---- Molar Mass emp. form.
Formula for calculating mass?
The formula for calculating mass is mass = density x volume. This formula relates the mass of an object to its density (amount of matter in a given volume) and volume (amount of space an object occupies).
What is the formula mass of hydrogen?
The relative formula mass of a molecule of hydrgoen is two (2 x 1).
