Question

1.
p=80%
m pura= 240g
m impura=?
m impuritati=?
2.
m impuritati= 80g
m pura= 120g
m impura= ?
p= ?

Pentru exercitii dau 10 puncte si coronita.
Nu am mult timp ​

Answer 1

Răspuns:

1.m impura=masa pura/puritate×100 =240/80×100=3×100=300g

m impuritati= m impura-m pura = 300-240=60g

2.m impura=m pura+ m impuritati=120+80=200g

p=masa pura/masa impura×100=120/200×100=0,6×100=60%