Which chemical equation is balanced?

a.
2pcl5 + 2h2o → 2hcl + h3po4

b.
pcl5 + h2o → hcl + h3po4

c.
pcl5 + 3h2o → 5hcl + h3po4

d.
pcl5 + 4h2o → 5hcl + h3po4

How many neutrons does a atom of cobalt have?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Stage in which a star’s outer layers have started to cool and grow outward?