Question 1 The specific heats of Lead and Gold are both is 0.128 J/g°C. Which of

Question

Question 1 The specific heats of Lead and Gold are both is 0.128 J/g°C. Which of the following statements is not true? Select one: a. When 10.0 g of lead is heated from 25 °C to 35°C, it gains128 of heat b. When 10.0 g of gold is heated from 25°C to 35°C, it gains128 J of heat c. Gold and Lead have the same molar heat capacity d. None of the statements are false e. Lead has the higher molar heat capacity Question 2 Calculate H for the reaction 4 NH, (g) + 5 O. (g) 4 NO (g) + 6 H2O (g), from the following data: N, (g) + O. (g) 2 NO (g) N: (g) + 3 H, (g) 2 NH, (g) H = 2H(g) +0,(g) 2H0(g) AH -181 kJ Question3 The combustion of propane produces heat according to the equation: C,H,(g) + 50,(g) 3CO(g) + 4H0(g) 2044 kJ How much heat will be evolved if 2.20g of propane is combusted? Question 4 A 20.0 g piece of a metal with specific heat of 0.900 J/g.C at 98.0 C dropped into 50.0 g water in a calorimeter at 20.0 C The specific heat of water is 4.18 J/g. C Calculate the final equilibrium temperature of the mixture Question 5 A gas heated and it absorbs 100 kJ of heat. It expand doing 25 k of work. What is the internal energy change of the gas? Question 6 Calculate the standard enthalpy of formation of C,H(g), given that AH°fCO2(g)]--394 kJ/mol and propane, AHf] H2O(l)--242 kJ/mol, and the following thermochemical equation C,H,(g) + 50(g) 3C0(g) + 4H0(g) 2044 kJ Question7 Given that the molecular formula of sand is SiO, and that its specific heat is 0.84 J/g C, its molar heat capacity is

Explanation / Answer

Question 1.

if both CP are the same... then

Q = m*C*(Tf-Ti)

Q = (10)(0.128)(35-25) = 12.8 J

A is false

b)

must be false as well

c)

False, since molar heat cpacity depends on molar mass, which is not the same

d)

True

e)

False

Cp molar = Cpmass/ MW of species

MW of lead = 207.2

MW of Au = 196

the..

Cp lead = 0.128 / 207.2 = 0.0006177

Cp Au= 0.128 / 196.97 = 0.000649

Clearly, Au > Pb

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.