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Student was identifying the formula of 1 mole of unknown powder. When it was placed on a scale, it was reading 399.91 g/mol. Which of
the following compounds can it be?
A AI(NO3)3
B. C3H8
C. Fe2(SO4)3
D. CaCl2

Respuesta :

Answer: The compound is [tex]Fe_2(SO_4)_3[/tex]

Explanation:

Molar mass is defined as the mass in grams of 1 mole of a substance.

S.I Unit of Molar mass is gram per mole and it is represented as g/mol.

A. 1 mole of [tex]Al(NO_3)_3[/tex] weighs = 26.98(1)+14.01(3)+15.99(9) =212.99 g/mol

B. 1 mole of [tex]C_3H_8[/tex] weighs = 12.01(3)+1.007(8) = 44.1 g/mol

C. 1 mole of [tex]Fe_2(SO_4)_3[/tex] weighs = 55.84(2)+32.06(3)+15.99(12) = 399.91 g/mol

D. 1 mole of [tex]CaCl_2[/tex] weighs = 40.07(1)+35.5(2)= 110.98 g/mol

Thus the compound is [tex]Fe_2(SO_4)_3[/tex]

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