7) 7) Read the length of the metal bar with the correct number of significant fi

Question

7) 7) Read the length of the metal bar with the correct number of significant figures at 12 13 14 15 16 17 ric ERASER 1! cm A) 20 cm B) 15.000 cm C15 cm D) 15.0 cm E)15.00cm 8) Determine the solubility of N2 in water exposed to air at 25C if the atmospheric pressure is 20 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitrogen in water at this temperature is 6.1 × 10-4 M/atm. A)64×10-4 M B) 1.2 10-4 M 91.1 × 10-4 M D) 1.6 10-4 M E) 9.5 x 10-4 M 9) Identify the following piece of lab equipment A) graduated cylinder B) volumetric flask ) pipette D) buret E) none of the above

Explanation / Answer

Answer:

7) The reading in the sacale is showing at 15 cm.

But the reading we have to write in the way 15.0 cm. Beacause 1 cm=10 mm, in the scale the lines between 1 cm distance are 10. So it is written as 15, 15.1, 15.2, 15.3 etc.

The length of the metal bar is written as 15.0 cm.

Option (D) is correct.

As per guide lines I answered first question.

(9) The image is representing volumetric flask.

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