Question

Match the following physical quantities with units.

$\begin{array}{cccc}& Physicalquantity& & Unit\\ A.& Molarity& 1.& gm{L}^{-1}\\ B.& Molefraction& 2.& mol\\ C.& Mole& 3.& Pascal\\ D.& Molality& 4.& Unitless\\ E.& Pressure& 5.& mol{L}^{-1}\\ F.& Luminuosintensity& 6.& Candela\\ G.& Density& 7.& molk{g}^{-1}\\ H.& Mass& 8.& N{m}^{-1}\\ & & 9.& kg\end{array}$

Answer 1

$A\to \left(5\right)B.\to \left(4\right)C.\to \left(2\right)D.\to \left(7\right)E.\to \left(3\right)F.\to \left(6\right)G.\to \left(1\right)H.\to \left(9\right)$

A. Molarity = concentration in $mol{L}^{-1}$

Molarity = $\frac{Numberofmoles}{Volumesinlitres}$

B. Mole fraction = Unitless

C. Mole = $\frac{Mass\left(g\right)}{Molarmass\left(gmo{l}^{-1}\right)}=mol$

D. Molality = concentration in mol per kg solvent

Molality $=\frac{Numberofmoles}{Massofsolvent\left(kg\right)}$

E. The SI unit for pressure is the pascal is the pascal (Pa), equal to one newton per square metre

$\left(\frac{N}{m^2}orkg{m}^{-1}{s}^{-2}\right)$ This special name for the unit was added in 1971 before that, pressure in SI was expressed simply as $\frac{N}{m^2}$

F. Unit of luminuos intensity = candela
The candela is the luminuos intensity, in a given direction, of a source that emits monochromatic radiation of frequency $540\times {10}^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{683}$ watt per steradian

G. $Density=\frac{mass}{volume}=gm{L}^{-1}$

H. Unit of mass = kilogram
The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram