(6.022 x 10^23 atoms/1 mole Neon)(1 mole Neon/20.18g)(80 g Ne)= <span>2.4 x 10^24 </span>
Mass = 10.8 g
volume = 0.56 cm³
Density = mass / volume
D = 10.8 / 0.56
D = 19.29 g/cm³
Is Gold . ( Density of gold )
hope this helps!
The total charge of a compound must be zero. So the Y ion has charge of -2. Then the charge of X ion+(-2)*2=0. So the charge of X ion is +4.
Answer:
microorganism can bee seen yes
Half life means is the amount of time only half the uranium is left. So after 68.9 years only 150/2 = 75 g is left. Another 68.9 years go by and then 75/2 = 37.5 g remains. See the pattern here?
then you can divide 250 by 68.9 to see how many times it's halved or just write the equation:
A = 150(0.5)^(t/68.9)
t is 250 years, A is amount left
A = 150(0.5)^(3.63)
A = 12.13 g