How many helium atoms are in a helium blimp containing 498 kg of helium?

Zinc metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of zinc (ii) chloride. what is the reducing agent in this reaction? maybe prof. umbridge was right in trying to remove her.

When 4.31 g of a nonelectrolyte solute is dissolved in water to make 635 mL of solution at 28 °C, the solution exerts an osmotic pressure of 945 torr. What is the molar concentration of the solution?

Power is calculated using

An atom contains 8 valence electrons this atom is probably a

If vinegar is added to baking soda, the reaction Cu (s) + 2Ag (NO3) (aq) à 2Ag (s) + Cu (NO3) 2 (aq) occurs. What evidence would indicate that the reaction is occurring? a. a precipitate is formed b. light and heat are given off c.

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

Which microscope came out first

Which exerts greater pressure on the floor-standing flat-footed or standing on tiptoe? on tiptoe, because the force acts over less area on tiptoe, because the force acts over more area flat-footed, because the force acts over more area flat-footed,

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller