3 years ago

2. A book sits on a table. Which of the following is true?

Chemistry

1 answer:

vagabundo [1.1K]3 years ago

4 0

Answer:

Explanation:

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ΔH for the reaction below is -826.0 kJ/mol. Calculate the heat change when a 69.03-g sample of iron is reacted.4Fe(s) + 3 O2(g)

Anuta_ua [19.1K]

Answer:

c. -1020.9 kJ

Explanation:

4Fe (s) + 3 O₂ (g) --> 2 Fe₂O₃(s) ΔH = -826.0 kJ/mol.

atomic weight of iron = 56

69.03 g = 69.03 / 56

= 1.23268 moles

Heat released by 1.23268 moles

= 1.23268 x 826.0

= -1020.9 kJ .

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3 years ago

Is this correct?? please help

NeTakaya

Yes it is but I have to check so wait

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2 years ago

Which of the following is an example of a phase change from liquid to gas?

netineya [11]

Correct answer to this question is c. water evaporating

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3 years ago

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Use the picture below to answer the question. Comparing Wave A (blue) to Wave B (red), Wave B has a

fenix001 [56]

Answer: B longer wave

Explanation:

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2 years ago

When a saturated solution of NH4Br dissolved in 100 grams of water is cooled from 60°C to 30°C, how much NH4Br will precipitate?

stepladder [879]

Answer:

$m_{precipitated}=24.8g$

Explanation:

Hello,

In this case, since at 60 °C, 108 grams of ammonium bromide are completely dissolved in 100 grams of water for a saturated solution, once it is cooled to 30 °C, wherein only 83.2 grams are completely dissolved in 100 grams of water, the following mass will precipitate:

$m_{precipitated}=108g-83.2g\\\\m_{precipitated}=24.8g$

Best regards.

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3 years ago