Concept explainers
Interpretation:
The empirical formula of lactic acid is to be determined with given mass of sample, carbon dioxide, and water.
Concept introduction:
Empirical formula is the simplest formula of any compound when written in the least possible whole number without altering the relative number of atoms.
The molecular mass of any compound is the sum of the
When any hydrocarbon has completely reacted with oxygen, then the product formed contains
Molar mass is calculated by adding masses of each and every element multiplied by their number of atoms (given in subscript). Its S.I. unit is
The number of moles is defined as the ratio of mass to the molar mass:
Here,
The mass of compound can be calculated as
Here,
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Chemistry
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- Chalky, white crystals in mineral collections are often labeled borax, which has the molecular formula Na2B4O7 10H2O, when actually they are partially dehydrated samples with the molecular formula Na2B4O7 5H2O, which is more stable under the storage conditions. Real crystals of borax are colorless and transparent. (a) Calculate the percent mass that the mineral has lost when it partially dehydrates. (b) Is the percent boron by mass the same in both compounds?arrow_forward3.96 Methyl cyanoacrylate is the chemical name for the substance sold as Super Glue, and it has the chemical formula C5H5NO2. Calculate the number of molecules of this substance in a 1.0-ounce tube of Super Glue, assuming that the glue is 80% methyl cyanoacrylate by mass.arrow_forwardHydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane: 2NH3(g)+3O2(g)+2CH4(g)2HCN(g)+6H2O(g) If 5.00 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield?arrow_forward
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