9)A water sample with unknown mass absorbed 100.0 J of heat and the temperature

Question

9)A water sample with unknown mass absorbed 100.0 J of heat and the temperature increased from 25.0 C to 29.1 C. What is the mass of this water sample? Specific heat of water = 4.184 J/(gC).

Note: To avoid any sig fig issues, please keep only two sig figs for your input!!

10)At equal mass, will 100 C water or 100 C steam cause more serious burn? Why?

11)Molar heat of neutralization of an acid or base is the enthalpy change for neutralizing one mole of that acid or base. If 0.10 mole NaOH reacted with 0.087 mole of HCl and 4.2 kJ of heat were released. What is the molar heat of neutralization of NaOH (or HCl)?

Note:

1. Make sure you have the correct sign for your answer.

2. To avoid any sig fig issues, please keep 2 sig figs for your input

12)If an aqueous reaction resulted an temperature decrease in solution, this reaction must be:

Explanation / Answer

hiii

1) use the formula q= mass x specific heat x T (difference)

100 J = m x 4.184 J/g x (29.1-25 )

100 = m x 17.15

m= 5.8

2.A)100 C steam because condensation of steam is exothermic. ( as this will cause release of heat , it causes burns more than water )

Related Questions

Navigate

• Browse (All)
• Browse 9
• Subjects

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