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

Question

7) Read the length of the metal bar with the correct number of significant figures 12 13 14 15 16 17 cm B) 15.000 cm 15 cm D) 15.0 cm E) 15.00 cm A) 20 cm 8) Determine the solubility of N2 in water exposed to air at 25°C if the atmospheric pressure is 2.0 8) 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 10-4M B) 1.2 10-4 M C) 1.1 10-4M D) 1.6 10-4M E) 9.5 10-4 M 9) Identify the following piece of lab equipment: 9) A) graduated cylinder B) volumetric flask C) pipette D) buret E) none of the above

Explanation / Answer

Ans 7 : E) 15.00 cm

The scale is read uoto 1/10 of the smallest division , such that the last digit in the measured value is the estimated digit. Since here 15.0 is the smallest division that could be read, so the measurement value will be 15.00 cm

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