A student did an experiment to find the amount of energy produced when hydrogen peroxide solution is decomposed using manganeso(IV) oxide. The
apparatus the student used is shown in the diagram.
Manganeso(IV) oxido
Thermometer
Beaker
-Hydrogen peroxide
2 point
The student first measured the temperature of the hydrogen peroxide.
Then the student added the manganese(IV) oxide and recorded the
highest temperature. The temperature rise was smaller than expected,
Suggest why
Your answer

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.