3 years ago

Orange juice is a mixture of several substances, including water, sucrose, and

Chemistry

1 answer:

LekaFEV [45]3 years ago

7 0

Answer:

C. The samples contain the same substances in a fixed proportion.

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Art [367]

Answer:

Explanation:

See attached table.

Note that:

1 mole = 6.02x10^23

Molar mass is grams/mole. For the elements, the atomic mass is the same number as molar mass, just expressed as grams/mole.

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2 years ago

How many sulfur atoms are there in 21.0 g of al2s3?

ValentinkaMS [17]

Given the mass of aluminum sulfide $Al_{2}S_{3}$ = 21.0 g

Molar mass of $Al_{2}S_{3}$ = $2 * Molar mass of Al + 3 *molar mass of S = 2(27g/mol)+3(32.g/mol)=150.g/mol$

Calculating the moles of $Al_{2}S_{3}$ :

$21.0 g *\frac{1 mol}{150 g} = 0.14 mol Al_{2}S_{3}$

Each mole $Al_{2}S_{3}$ has 3 mol S.

Each mole S constitutes $6.022*10^{23} atoms of S$

Calculating atoms of S in 0.14 mol $Al_{2}S_{3}$ :

$0.14 mol Al_{2}S_{3} *\frac{3mol S}{1 mol Al_{2}S_{3} }*\frac{6.022*10^{23}atoms S }{1 mol S}$

= $2.53 * 10^{23} atoms of S$

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3 years ago

1. Which of the following correctly represents a balance chemical equation? (a) NaCl + 2H2O → 2NaOH + 2Cl2 + H2 (b) 2NaCl+H2O →

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2 years ago

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