690.0 ml of oxygen are collected over water at 250.0 Celsius and a total pressure of 725.0 mmHg . What is the volume of dry oxygen at 50.0 degrees Celsius and 800.0 mmHg pressure

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.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2