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ololo11 [35]
3 years ago
9

How much heat is required to decompose 25.5 grams of NaHCO3? 2NaHCO3(s) + 129 kJ 2Na2CO3(s) + H2O(

Chemistry
1 answer:
Vaselesa [24]3 years ago
4 0
To determine the heat required in order to decompose a certain amount of a substance, we need information on the heat needed to decompose one mole of the substance. This value are readily available online and other sources. For this reaction, the heat needed is 129 kJ per 2 mol of NaHCO3. We calculate as follows:

129 KJ / 2 mol NaHCO3 (1 mol / 84.01 g ) (25.5 g NaHCO3 ) = 19.58 kJ of heat is needed.
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Answer:

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Explanation:

Given data:

mass of steam = 25 g

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Solution:

Formula:

q = m . c . ΔT

we know that specific heat of water is 4.186 J/g.°C

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now we will put the values in formula

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q = -10778.95 J

so, -10778.95 J heat must be removed in order to form the ice at 15 °C.

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