Which of the following measurements has three significant figures? A. 5100 m
B. 0.005 m
C. 0.510
D. 0.051

The correct answer is C: 0.510 m

N I C E - D A Y!

C

Explanation:

a) has 2 sig. figures

b) has 1 sig. figures

c) has 3 sig. figures

d) has 2 sig. figures

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

the ratio of the conjugate base to the acid required to attain the desired ph.