Question

find the number of each atoms and total number of
atoms in the yellowing
15.000 kg of C2H6​

Answer 1

Answer:

Chemical formulae are used as shorthand to indicate how many atoms of one

element combine with another element to form a compound.

C2H6, 2 atoms of carbon combine with 6 atoms of hydrogen to form ethane.

Mn(Cr2O7)2, one Mn combines with 4 Cr and 14 O to form manganese(II)

dichromate.

If we know the formula of a compound, determining the molar mass is simple.

Since we know the atomic masses of the elements, we can sum the atomic

masses to obtain the molecular masses.

1 atom of C2H6 contains 2 atoms of C 12.01 amu = 24.02

1 atom of C2H6 contains 6 atoms of H 1.0079 amu = 6.0474

30.0674 = 30.07 amu

We also know that 1 mole of C atoms weighs 12.01 g and 1 mol of H atoms

weighs 1.0079 g. So, we know the molar mass of ethane also.

1 mole C2H6, 2 moles of C 12.01 g x 2 24.02 g

1 mole C2H6, 6 moles of H 1.0079 g x 6 6.0474 g

30.0674 = 30.07 g/mole

Or, 30.07 g in 1 mole C2H6. So, we say the molar mass of ethane is 30.07

g/mol (that’s grams per mole).

1 mole Na2Cr2O7, 2 mole of Na 22.989 g x 2 47.978 g

1 mole Na2Cr2O7, 2 mole of Cr 51.996 g x 2 103.992 g

1 mole Na2Cr2O7, 7 moles of O 15.9994 g x 7 111.9958 g

263.9658 = 263.97 g/mole

Explanation:

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