A sample of hydrated calcium sulphate, CaSO4.xH2O, has a relative formula mass of 172. What is the value of x?

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘

Which of the following units is not an official si unit? mole liter kilogram ampere

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?