What is the number of moles in 500L of He

If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the A. luminous intensity. B. illuminance of a surface. C. incandescence. D. luminous flux.

According to the law of conservation of energy, what will most likely happen in a closed system? Energy will be exchanged along with matter Energy will be exchanged, but matter will not be exchanged Energy will be created along with matter Energy

38 When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is (1) decreased by a factor of 2. (2) increased by a factor of 2. (3) decreased by a factor of 200.

A sample of argon gas is at a pressure of 1.725x10^4 kPa and a temperature of 24°C in a rigid 20 L tank. How many moles of argon does this tank contain? (show your work)

Lithium has been found to be especially effective in the treatment of

How many protons does one atom of sulfur have

Which shows the electron configuration for zinc (Zn) ? [Kr]5s24d10 [Kr]5s24d6 [Ar]4s23d9 [Ar]4s23d10

What is the oxidation number of chromium in the ionic compound ammonium dichromate (nh4) 2cr2o7?

Draw an ecosystem with 10 biotic and 5 abiotic factor

Which organism is responsible for cleanup in this ecosystem? coyote vulture prairie dog grasshopper or prairie grass