Which has more molecules, a teaspoon of water that has a mass of 1.25 grams or a teaspoon of ethanol -C 2 H 5 OH that has a mass of 0.890 grams ?

Water has more molecules.

Explanation:

The number of molecules in each compound can be calculated by using the formula,

Number of moles(n) = Mass(M)  / Molecular weight of compound(M.wt)

Given,

Mass of Water = 1.25 grams,

Mass of Ethanol = 0.890 grams,

We know calculate the molecular weight of Water and Ethanol

SInce, Molecular formula of water is H₂O.

Atomic mass of Hydrogen = 1

Atomic mass of Oxygen = 16

Therefore Molecular weight of Water = 2(1) + 16 = 18.

SInce, Molecular formula of Ethanol is C₂H₅OH.

Atomic mass of carbon is = 12

Atomic mass of Hydrogen = 1

Atomic mass of Oxygen = 16

Therefore, Molecular weight of Ethanol = 2(12) + 5(1) + (16) + (1) = 46.

Now, number of moles or molecules of water(n) = 1.25/18

By solving we get number of moles or molecules of water (n)= 0.06944 molecules.

Now, number of moles or molecules of Ethanol(n) = 0.890/46

By solving we get number of moles or molecules of Ethanol (n)= 0.06944 molecules. n = 0.01934.

By observation of both 'n' values we can know that water has more molecules.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml