3 years ago

HELPPPPPP PLZZZZZ! FILE ATTACHED BELOW! ASAP PLZZZ!

Chemistry

1 answer:

baherus [9]3 years ago

4 0

90 would be my guess.

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MULTIPLE CHOICE QUESTION

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Determine the number of moles of citric acid in 10.0 mL of pineapple juice

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The mercury content of a stream was believed to be above the minimum considered safe—1 part per billion (ppb) by weight. an anal

shutvik [7]

Answer:

Amount of mercury is 1.0*10⁻⁵ g

Explanation:

Given:

Mercury content of stream = 0.68 ppb

volume of water = 15.0 L

Density of water = 0.998 g/L

To determine:

Amount of mercury in 15.0 L of water

Calculation:

$1 ppb = \frac{1\mu g(solute)}{1L(solvent)}$

where 1 μg (micro gram) = 10⁻⁶ g

0.68 ppm implies that there is 0.68 *10⁻⁶ g mercury per Liter of water

Therefore, the amount of mercury in 15.0 L water would be:

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4 0

3 years ago

A reaction is expected to produce 28.3 moles of hydrogen gas. If the hydrogen is collected at 297 K and 1.08 atm, what is the vo

Vinil7 [7]

Answer:

The correct answer is 639 L H₂

Explanation:

We use the ideal gas equation:

We have the following data:

n = 28.3 mol

T= 297 K

P= 1.08 atm

R= 0.082 L.atm/K.mol (gas constant)

We introduce the data in the gas equation to calculate the volume (V):

PV=nRT

⇒V =nRT/P = (28.3 mol x 0.082 L.atm/K.mol x 297 K)/(1.08 atm) = 638.2 L ≅ 639 L

Therefore, the correct option is 639 L H₂

4 0

3 years ago

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