Someone help this is so hard
2 answers:
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Answer:
<em>1) Molecular weight: 18g/mol </em>
<em>Density: at room temperature (25ºC) is 0.997g/mL</em>
<em>Moles: 0.55moles</em>
<em>2) Molecular weight: 182g/mol</em>
<em>Density: at room temperature (25ºC) is 1.11g/mL</em>
<em>Moles: </em>
Explanation:
1) The molecular formula of water is thus, the molecular weight is the sum of the weights of its atoms.
H: 1g/mol x 2 = 2g/mol
O: 16g/mol x 1 = 16g/mol
: 2g/mol + 16g/mol = 18g/mol
The density (δ) of water at room temperature (25ºC) is 0.997g/mL
Therefore, the weight (m) of 1mL of water is:
m = δ.V =
Multiplying the mass by its molecular weight gives the number of moles:
2) The molecular formula of benzophenone is thus, the molecular weight is the sum of the weights of its atoms.
C: 12g/mol x 13 = 156g/mol
H: 1g/mol x 10 = 10g/mol
O: 16g/mol x 1 = 16g/mol
: 156g/mol + 10g/mol + 16g/mol = 182g/mol
The density (δ) of water at room temperature (25ºC) is 1.11g/mL
Multiplying the mass by its molecular weight gives the number of moles: