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I am Lyosha [343]
3 years ago
14

Determine the number of moles in 258.45 grams of iron (III) chloride (FeCl3). Show and explain all

Chemistry
1 answer:
QveST [7]3 years ago
3 0

Answer:

\boxed {\boxed {\sf 1.5935 \ mol \ FeCl_}}

Explanation:

To convert from grams to moles, we must use the molar mass. This can be found on the Periodic Table. First, find the molar mass of iron and chlorine.

  • Fe: 55.84 g/mol
  • Cl: 35.45 g/mol

Check the formula. There is a subscript of 3 after Cl, so there are 3 atoms of chlorine in 1 molecule. Multiply iron's molar mass by 3, then add iron's molar mass.

  • FeCl₃: 55.84 + 3(35.45) = 55.84+106.35=162.19 g/mol

Use this number as a ratio.

\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}

Multiply by the given number of grams.

258.45 \ g \ FeCl_3 *\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}

Flip the ratio so the grams of iron (III) chloride cancel.

258.45 \ g \ FeCl_3 *\frac {1  \ mol \ FeCl_3}{162.19 \ g\ FeCl_3}

258.45  *\frac {1  \ mol \ FeCl_3}{162.19}

\frac {258.45  \ mol \ FeCl_3}{162.19}

1.59350144892 \ mol \ FeCl_3

The original measurement of grams has 5 significant figures, so our answer must have the same. For the number we calculated, that is the ten thousandth place.

1.5935 \ mol \ FeCl_3

258.45 grams is approximately 1.5935 moles of iron (III) chloride.

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