1C_S11_Midterm_2_Key

1C_S11_Midterm_2_Key - C hem 1C Russak M idterm 2 Key 20...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 1C Russak Midterm 2 Key 20 May 2011 You will lose 10 % if you do not fill your perm number correctly, forget to bubble the test form, or forget to put your name on the Scantron. There is only 1 correct answer for each question, marking more than one answer will cause you to get that question wrong. There are no penalties for guessing, so you should fill in an answer even if you don’t know it.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chem 1C Russak Midterm 2 Key 20 May 2011 1. Liquid ammonia (boiling point = -33.4 ° C) can be used as a refrigerant and heat transfer fluid. How much energy is needed to heat 25.0 g of NH 3 ( l ) from -65.0 ° C to - 12.0 ° C? Specific heat capacity, NH 3 ( l ) : 4.7 J/(g · K) Specific heat capacity, NH 3 ( g ): 2.2 J/(g · K) Heat of vaporization: 23.5 kJ/mol Molar mass, м : 17.0 g/mol A. 5.5 kJ B. 6.3 kJ C. 39 kJ D. 340 kJ E. 590 kJ 2. Examine the phase diagram for the substance Bogusium (Bo) and select the correct statement. A. Bo( s ) has a lower density than Bo( l ). B. The triple point for Bo is at a higher temperature than the melting point for Bo. C. Bo changes from a solid to a liquid as one follows the line from C to D. D. Bo changes from a liquid to a gas as one follows the line from C to D. E. Point B represents the critical temperature and pressure for Bo. 3. The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution? (1cm 3 = 1mL) Density of ethanol = 0.80 g/cm 3 Density of water= 1.0 g/cm 3 Molecular wt. of ethanol= 46 g/mol A) 0.46 M B) 0.80 M C) 0.92 M D) 8.0 M E) 17 M
Background image of page 2
Chem 1C Russak Midterm 2 Key
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 6

1C_S11_Midterm_2_Key - C hem 1C Russak M idterm 2 Key 20...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online