22) Which graph represents how the volume of a gas changes with pressure at A) c

Question

22) Which graph represents how the volume of a gas changes with pressure at A) constant temperature and number E) B) C) D) 23) A 500 gram sample of compound X was dissolved in 25.00 g of DI H20 in an 8oz styrofoam eup. The temperatur erose from 19.8oC to 25.0oC: r the specific heat of the solution is approximately equal to the gwhat is theaH for the reaction cheat of water, 1841/and the formula weight Fwgxisg xish X)-Xlag) in J/mol A) -1.25 X 104J/mol B) 1.25 x 10t J/mol C) 4.35 X 101 /mol D)-6.5 X 102 J/mol E) 6.5 X 102 J/mol 24) At 411 nm, the absorbance of 4 solutions of K2Cr04 were measured at different concentrations. The data collected is given below 100x 10-6 0.24 115x 10-6 0.28 140 x10-6 0.34 200 x 10-6 0.48 What would you expect the absorbance to a solution of KoCrOg(ag) to be whose concentration is 170 x 106MM A) 0.41 B) 0.51 C) 0.31 D) 0.17 E) 0.26 25) After monitoring the temperature of 25 mlof DI water in a styrofoam cup for 180 s, a 2.00 g sample of NaHCO3 is added with stirring, The temperature of the mixture is recorded for an additional 300 s. What picture describes how the temperature changes with time? A) C) D) E) Temp Te A-4

Explanation / Answer

22)

According to Boyle’s law

P*V = constant

So,

P and V are inversely related

the correct graph is A

Answer: A

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