The barometer shown in fig. p1.35 contains mercury ( 5 13.59 g/cm3 ). if the local atmospheric pressure is 100 kpa and g 5 9.81 m/s2 , determine the height of the mercury column, l, in mmhg and inhg.

Given:

Density of mercury (ρ) = 513.59 g/cm3 = 513.59*10^3 kg/m3

Patm = 100 kPa

g = 59.81 m/s2

To determine:

The height (h) of the column

Calculation:

Patm = ρgh = 513590*59.81*h

100,000 = 3.0718*10^7*h

h = 0.00325 m

1 inch = 0.0254 m

h = 0.128 inches

Ans: height (h) = 0.00325 m or 0.128 inches

The answer if Na2O. Explanation: When you write the formula, write such a way that the compound is neutral. Since Na has 1+ charge and O has 2- charge, you need 2 Na to balance the 2- charge of O. Easy way to do this is to criss-cross the charge of the atoms as the subscripts in the formula. Use the simplest integer ratio at the end. Example: 1) Mg^2+ and P^3- Formula: Mg3P2 2) Ca2+ and O2- Formula: Do not write as Ca2O2. Instead write as CaO 3) Al^3+ and O^2- Formula: Al2O3.

ANSWER: Na20  

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