You can get the Atomic Masses in a Periodic Table: K = 39,1u; Cr = 52,0u; O = 16,0u. Then do de sum: (39,1*2+52*2+16*7) = 294,2u The concept on Formula Mass is similar to the Molecular Mass, but applied to a ionic compound.
The mass of a compound can be determined by summing the mass of the individual parts. For the constituent elements in potassium carbonate:
MK = 39.0983 g/mol
MC = 12.0107 g/mol
MO = 15.9994 g/mol
where Mx designates the molecular mass of element x in grams/mole.
The molecular mass of the compound, then, is:
2(MK) + 1(MC) + 3(MO) = 138.1965 g/mol
This has the correct number of significant figures and to convert to pure grams, we must be given an amount of the substance (usually in moles). Assuming we have 1 mole of the compound, we have
138.1965 g/mol * 1 mol = 138.1965 g
Count the subscripts: 2+2+7=11 atoms per formula unit. Note that if an element does not have a subscript in a formula, it's understood to be 1, and you still have to count it. (For example, H2O means 3 atoms total.)
Like other ionic compounds, K2Cr2O7 does not have true moles. Its gram formula unit mass is 294.18.
230.187 g mol-1but it would not be a stable compound.
The formula mass for K2CO3 is 138.2055 g/mole.
potassium dichromate
still be the same K2Cr2O7
294.185 g mol-1
The name for K2Cr2O7 is potassium dichromate.
The formula for lithium hydrogen phosphate is Li2HPO4.
A compound formula, or molecular formula, tells you about the chemical composition of the substance in terms of the number of atoms of that element that are present. From there, the empirical formula may also be derived by simplifying the molecular formula, as well as its structural formula.
The formula for acetaminophen, otherwise known as paracetamol, is C8H9NO2
If Trioxide refers to Ozonide ion, the formula is O3-
The chemical formula of potassium dichromate is K2Cr2O7
Formula: K2Cr2O7
K2Cr2O7
The chemical forrmula of potassium heptaoxodichromate(VI) is K2Cr2O7. The systematic IUPAC name is potassium dichromate (VI).
The chemical formula of potassium dichromate is K2Cr2O7; and the molecular mass is 294,185.
224 grams of Oxygen will be in 2 moles of Potassium dichromate.
KCrO4 does not exist it is K2CrO4 and is called Potassium Chromate. Potassium dichromate is K2Cr2O7
potassium dichromate
Yes, potassium sulfide is a molecular compound.
K2Cr2O7(aq) ------> 2K+(aq)+Cr2O72-(aq)
1N of k2cr2o7=49.09 gm/1 L 0.25N=12.2725 gm of k2cr2o7 in 1 L of water.
potassium dichromate- K2Cr2O7 12.5 grams K2Cr2O7 *(1 mol K2Cr2O7/294 grams K2Cr2O7)= .0425 mols K2Cr2O7 There's two mols of K (potassium) for every 1 mol of K2Cr2O7 (Potassium Dichromate) so you multiply the K2Cr2O7 by two to get mols of K .0425 mols K2Cr2O7*(2 mols K/1 mol K2Cr2O7)=.085 mols K Multiply by the molar mass of K to get grams .85 mols K*(39 grams/1 mol K)= 3.32 grams potassium