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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.
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∙ 14y ago
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∙ 13y agoThe 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
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∙ 10y agoCount 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.)
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∙ 11y agoLike other ionic compounds, K2Cr2O7 does not have true moles. Its gram formula unit mass is 294.18.
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∙ 11y ago230.187 g mol-1but it would not be a stable compound.
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∙ 11y agoThe formula mass for K2CO3 is 138.2055 g/mole.
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∙ 14y agopotassium dichromate
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∙ 13y agostill be the same K2Cr2O7
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∙ 11y ago294.185 g mol-1
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Name of K2Cr2O7?
The name for K2Cr2O7 is potassium dichromate.
What is the formula for lithium hydrogen phosphate.?
The formula for lithium hydrogen phosphate is Li2HPO4.
What does a compound formula tell you?
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.
What is the molecular formula of paracetamol?
The formula for acetaminophen, otherwise known as paracetamol, is C8H9NO2
What is ethane's hydrocarbon formula?
The hydrocarbon formula of the chemical ethane is C2H6.
What is the formula for patassium dichromate?
The chemical formula of potassium dichromate is K2Cr2O7
What is the chemical formula of potassium dichlormate?
Formula: K2Cr2O7
What is the chemical formula of potassium dicromate?
K2Cr2O7
What is the chemical formula for potassium heptaoxodichromate VI?
The chemical forrmula of potassium heptaoxodichromate(VI) is K2Cr2O7. The systematic IUPAC name is potassium dichromate (VI).
What is the relative formula mass of each of the following compounds of potassium dichromate?
The chemical formula of potassium dichromate is K2Cr2O7; and the molecular mass is 294,185.
He formula for potassium dichromate is KËÃCrËÃOËÈ How many grams of oxygen will be in 2 moles of potassium dichromate?
224 grams of Oxygen will be in 2 moles of Potassium dichromate.
What is the name of this formula k2CrO4?
KCrO4 does not exist it is K2CrO4 and is called Potassium Chromate. Potassium dichromate is K2Cr2O7
What is the compound for K2Cr207?
potassium dichromate
Is K2Cr2O7 a formula unit or molecules?
Yes, potassium sulfide is a molecular compound.
What is the dissociation equation for K2Cr2O7?
K2Cr2O7(aq) ------> 2K+(aq)+Cr2O72-(aq)
How do you make 0.25N K2Cr2O7 solution?
1N of k2cr2o7=49.09 gm/1 L 0.25N=12.2725 gm of k2cr2o7 in 1 L of water.
How many grams of potassium are in 12.5 g potassium dichromate?
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
