The solder once used by plumbers to ten copper pipes to together consists of 67% lead and 33% tin. What is the mass of lead in a 250-g block of solder?

Dec 24, 2017

See the explanation below

Explanation:

The composition of solder is

• 67% Pb

• 33%Sn

If the mass of block of solder is $= 250 g$

Mass of lead in the alloy is $= \frac{67}{100} \cdot 250 = 167.5 g$

Mass of tin in the alloy is $= \frac{33}{100} \cdot 250 = 82.5 g$