Answers:
1. 7500 J; 3800 J/g
Step-by-step explanation:
1. Joules gained by water
q = mcΔT
Data:
m = 100 g
C = 4.184 J·°C⁻¹g⁻¹
ΔT = 18 °C
Calculation:
q = 100 × 4.184 × 18 =7500 J
2. Joules per gram of Pringle
Energy gained by water = energy lost by Pringle
q = -mΔH
7500 J = -1.984 g × ΔH
ΔH = -7500 J/1.984 g = -3800 J/g
Pringles contain 3800 J of food energy per gram.
<h3>What is spectrometric method?</h3>
- A technique called spectrophotometry uses light intensity measurements as a beam of light travels through a sample solution to determine how much a chemical compound absorbs light.
- Every chemical either absorbs or transmits light across a specific spectrum of wavelengths, according to the fundamental principle.
- There are two main techniques used among the various forms of spectrophotometry:
- ultraviolet-visible range spectrophotometry, which examines the reflectance of certain spectra,
- and absorption spectrophotometry, which examines the absorption of radiation and particular spectra of light.
- Applications of spectrophotometry are useful for determining how well gases, liquids, and solids transmit, reflect, and absorb light.
Learn more about spectrometric method here:
brainly.com/question/18339003
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Answer:
10.3 mol Ga(ClO₃)₃
Explanation:
Let's consider the following balanced thermochemical equation.
2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃