Asingle gram of a certain substance has 0.52 gram of copper and 0.26 gram of zinc. the remaining portion of the substance. is nickel. ben estimated that 0.2 gram of nickel is in 1 gram of the subtance. he used this estimate the amount of nickel in 35 grams of the substance. find the result of bens estimation strategy. then find the exact amoumt of nickel in 35 grams of the subtance

We know that

the exact amount of nickel in 1 gram of substance is
1-(0.52+0.26)> 1-0.78> 0.22 g

the estimate amount of nickel (Bens estimation strategy) in 1 gram of substance is> 0.20 g

then

Part A) Find the estimate amount of nickel in 35 grams of the substance
if 1 g of the substance> 0.20 g nickel
 35 g> X
X=35*0.20> 7 g

the answer Part A) is
the estimate amount of nickel in 35 grams of the substance is 7 g

Part B) Find the exact amount of nickel in 35 grams of the substance
if 1 g of the substance> 0.22 g nickel
 35 g> X
X=35*0.22> 7.7 g

the answer Part B) is
the exact amount of nickel in 35 grams of the substance is 7.7 g