Question

a certain ore is 34.4% nickel by mass. How many kilograms of this ore would need to dig up to have 30.0g of nickel?

Answer 1

Let us say that:

x = mass of ore

y = mass of nickel

Therefore the equation relating the two is:

0.344x = y

Now solve for x when y = 30 g:

0.344 x = 30 g

x = 87.21 g

Therefore 87.21 g of ore is needed.