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☆☆☆☆☆The molecular formula specifies the actual number of atoms of each element in a molecule.
16.0 lbs = 7,257 g of O2
Oxygen exists in the gas form as 02
7,257g O2 * 1 mol O2/ 32 g * 2 mol O / 1 mol O2 * 6.022x10^23 atoms/mol
= 2.73E26 atoms of O
A+B ➝AB
it tells which compounds will dissolve in water
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
the reactants are compounds that react to form new compounds , the products
It compares how reactive the metals are
It predicts if one metal will replace another metal in a compound
2 m
they express the numbers using scientific notation
2.4 oz
It can shorten the expression into a number that can more easily be understood by giving an order of magnitude to the number. For example, would you write 0.00000000000000000045 or would you write 4.5 X10-19.
OH- 2H+ -> 2H2O(I)
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The reactants will have one Na, one Cl, one O, and two H atoms
combustion and expansion
Challenges to hydrogen as fuel include no distribution network, ie gas stations, and fear that the car co u l d explode like the Hindenburg.
The color of corn is different than the color of gasoline or coal
APEX
It is 7.28*10^-7 in scientific notation
H2
It is the same as the element’s atomic mass, but in grams.
2
