PLEASE HELP ME FIND THE PERCENTAGES! WILL MARK BRAINLIST! also please provide explanation ty

Concept of Percent

Explanation:

1st => Try to understand the definition of percent (%)

         Percent (% ) = (Part/Total) x 100%

Part => represents the item of interest ( in this case mass of evap dish) = 37.593g

Total => represents the combined total of all items in a mix ( evap dish + SiO₂) = 38.072g

∴Wt % of evap dish = part/total x 100% = 37.593g/38.072g x 100% = 98.726%

Now, if you wish to have the %SiO, the same idea applies. That is,

%SiO₂ = (Wt of SiO₂ / Wt of Evap Dish + SiO₂) x 100%

= (0.4805g/28.072g) x 100% = 1.274% SiO₂

To check work, add %Evap Dish + %SiO₂ = 98.726% + 1.274% = 100%

NOTE => Percent(%) is always a fraction (Part) of some total combined mix of items (Total).

Best of Luck, Doc :-)

може ли да зареждате повече информация, моля

the answer is d.) potassium