Answer:
O Presence of nucleus in cells
Explanation:
The equation ΔHsoln = ΔH1+ΔH2+ΔH<span>3 means that either the solution is endothermic (</span>ΔH < 0, the resulting reaction is cold) or exothermic (ΔH>0, the resulting reaction is hot). The lattice energy can be solve through this equation,
<span>lattice energy = </span>ΔHsolvation - IMF - ΔHsoln<span>
</span>
Answer:
Explanation:
Please tell me if im wrong
Question 6. 6. In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm3 of gas. What volume will two tablets produce?
(Points : 3)
400 cm3
600 cm3
800 cm3
1,200 cm3****
Question 7. 7. You breathe in 3.0 L of pure oxygen at 298 K and 1,000 kPa. How many moles of oxygen did you take in? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.)
(Points : 3)
0.05 moles
1.21 moles*****
2.42 moles
20.0 moles
Question 8. 8. Consider a gas at STP in a container of 22.4 L. If you apply the ideal gas law, what is the approximate value of n?
(Points : 3)
0.5
8.31
224****
1
Question 9. 9. Water boils at 100°C. What is that temperature on the Kelvin scale?
(Points : 3)
213 K
325 K****
333 K
373 K
Question 10. 10. The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.5 m/s, respectively. Which cylinder contains gas that is closest to absolute zero?
(Points : 3)
A
B
C******
D
I suck at chemistry
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Here we have to get the item which has more thermal energy among the given options.
The item a) will have more thermal energy than b)
The thermal energy of a compound can be determined from the formula H = m×s×t (H = thermal energy, m = mass of the compound, s = specific heat of the compound, t = temperature)
a) Here m = 500 g, s = 1 g/mL and t = 50⁰C (as the density of water is 1 g/mL thus its volume is equivalent to its mass)
Thus the thermal energy H = 500 × 1 × 50 = 25000 Cal (The energy needed to raise 1⁰C temperature of 1g water is calorie unit)
similarly,
b) Here m = 100 g, s = 1 g/mL and t = 50⁰C (as the density of water is 1 g/mL thus its volume is equivalent to its mass)
Thus the thermal energy H = 100 × 1 × 50 = 5000 Cal (The energy needed to raise 1⁰C temperature of 1g water is calorie unit).
Thus option a) i.e. 500 mL of water at 50 degree Celsius will have more thermal energy.
Thus the thermal energy of both the item have calculated and compared.
Answer:
11.19% hydrogen and 88.81% oxygen
Explanation:
