Answer:
there needs to be 4 Ca(CO3)
Explanation:
Answer:
0.38 moles He
Explanation:
from the ideal gas law PV= nRT you can calculate the volume of 1 mole at STP (273..1K and 1 atm of pressure) the MOLAR VOLUME IS
22.4 L
In the problem you have 8.4L
8.4 L/22.4 L=0.375 moles
so
0.38 moles He
The density of the object is 5 g/cm
<span>Dark matter has been given this name because it doesn’t seem to interact with regular matter in any way. It doesn’t collide with it, or absorb energy from it. We can’t see it or detect it with any of our instruments. We only know it’s there because we can see the effect of its gravity.</span>
If we draw a Lewis structure of a Phosphorus tetrachloryl ion (PCl+4), the geometry of the ion is tetrahedral. Now, we can measure the bond angle between two of the phosphorus - chlorine bonds. The bond angle for tetrahedral structures is 109.5 degrees.