A certain ore is 39.0% nickel by mass. How many kilograms of this ore would you need to dig up to have 10.0g of nickel

0.02564 kg ore contain 10.0 g of nickel.

Explanation:

Given data:

Percentage of nickel in ore = 39.0%

Mass of ore required to have 10 g of nickel = ?

Solution:

39.0% means that 39.0 g of nickel is present in 100 g of ore thus,

39/100 = 0.39

0.39 × X = 10.0 g

X =  10.0 g/0.39

X = 25.64 g

Gram to kilogram:

25.64 g × 1kg /1000 g

0.02564 kg

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