Question

find the number of mole molecules in the following a. 2.8g KOH b. 6.022×10^23 H2​

Answer 1

Answer:

a)0.04 b)1

Explanation:

for this problem, you need the avogadro number. it's a constant. the avogadro number tells you how many particles there are in a mole. that's why a mole is called the chemists dozen. 1 mole = 6.02 x 10^23, which is the avogadro number.

n(amound of moles)=m(mass) / mw(molecular weight)

you already have the mass of KOH, the molecular weight is k + o + h. molecular weight of k=39.09

molecular weight of o=16

molecular weight of h=1

it adds up to 56.09.

so n=2.8/56.09=0.04 moles.

for b, you simple have a mole of H2.