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Sigma
Lv 4
Sigma asked in Science & MathematicsChemistry · 1 decade ago

Chemistry Question - basic?

What is the mass of NH³in a 80.0cm³sample which has a density of 0.92 g/cm³ and consists of 20.0% (by mass) NH³. (NH³ is supposed to be a subscript 3 meaning 3 atoms of hydrogen.)

Thanks for the help. Need right away please.

A. 20g

B. 25g

C. 45g

D. 15g

E. 74g

1 Answer

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  • steve_geo1
    Lv 7
    1 decade ago
    Favorite Answer

    Let the sample be called S.

    80.0cm^-3S x 0.92gS/1cm^3S x 20gNH3/100cm^3S = 15g NH3 to two significant figures (D.)

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