Want this question answered?
Step 1: what's the molar mass of caffeine? Using the periodic table, 12(8)+1(10)+14(4)+16(2)=194 g/mol. Step 2: given 34.5 grams, how many moles is that? 34.5/1=194/x; solve for x to get 0.18 moles caffeine. Step 3: how many molecules of caffeine is that? 0.18 moles times Avogadro's constant; 0.18(6.02x1023)=1.08x1023 molecules. Step 4: how many carbon atoms is that? Formula says 8 carbon atoms per molecule; 8(1.08x1023)=8.64x1023 carbon atoms. This wasn't too hard because you didn't have to change up the scientific notation at all. Just watch your proper scientific notation format in you do have to change it.
Percentage composition= (mass of the element/mass of the molecule)*100 The fraction of the molecule's mass that comes from the element's mass
Percentage composition= (mass of the element/mass of the molecule)*100 The fraction of the molecule's mass that comes from the element's mass
If the compound stated in the question exists, its gram molecular mass is (14 times the gram atomic mass of carbon) plus (9 times the gram atomic mass of hydrogen) + (15 times the gram atomic mass of chlorine), or about 709 grams. Therefore, the number of molecules of the compound in 1.0 gram of it is (1.0)(Avogadro's number)/709 or about 8.49 X 1020. Each molecule contains 14 (exact) carbon atoms, for a total of 1.2 X 1022 atoms of carbon, to the justified number of significant digits.
The gram formula mass is 158.3
The molecular mass of a sulfur molecule is 32 g.
- calculate the molecular mass of the substance from the atomic weights of the contained elements - 1 molecule gram of any substance contain 6,023 141 79.1023 molecules (Avogadro number) - mass of a single molecule is: Molecular mass in grams/Avogadro number
the term gram molecule was used in chemistry and this unit is used to measure a single molecule in gram molecule.
The atomic mass of phosphurus is 31. The atomic mass of chlorine is 35.5. Therefore, the gram molecular mass of PCl3 is 31+3x35.5=137.5 grams per mole.
when atomic mass of an element expressed in gram atom is called gram atom mass . and formula is number of gram atom=given mass (in gram) by atomic mass ( in gram )
A gram is a unit of mass.
Step 1: what's the molar mass of caffeine? Using the periodic table, 12(8)+1(10)+14(4)+16(2)=194 g/mol. Step 2: given 34.5 grams, how many moles is that? 34.5/1=194/x; solve for x to get 0.18 moles caffeine. Step 3: how many molecules of caffeine is that? 0.18 moles times Avogadro's constant; 0.18(6.02x1023)=1.08x1023 molecules. Step 4: how many carbon atoms is that? Formula says 8 carbon atoms per molecule; 8(1.08x1023)=8.64x1023 carbon atoms. This wasn't too hard because you didn't have to change up the scientific notation at all. Just watch your proper scientific notation format in you do have to change it.
They have the same mass as a gram is a unit of mass.
The relative molecular mass of sulfate ion is 96. Sulfuric acid molecule has two protons attached to it. Therefore the GMM of sulfuric acid is 98g.
The Kilogram is the unit of mass, not the gram gram
The gram already is a unit of mass.
The gram molecular mass of the molecule must be measured by some independent method such as freezing point depression or boiling point elevation. Then the factor by which to multiply all of the subscripts in the empirical formula to get the molecular formula is the closest integer to the ratio of gram molecular mass to the gram molecular mass of a single unit of the empirical formula.