A tank contains 250 L of argon gas. The pressure is 8790 kPa and the temperature is 23*C. How many moles of argon are in the tank?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?

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∘