A helium balloon contains 0.48 g of helium. Given the molecular weight of helium is 4.0g/mol, how many moles of helium does it contain?

What does a steam engine do? A. Steam enters a cylinder and pushes a piston. B. Steam causes wheels to turn. C. Steam expands and spins an axle. D. Steam turns a turbine.

The gas arsine, AsH3, decomposes as follows. 2 AsH3 (g) 2 As (s) 3 H2 (g) In an experiment at a certain temperature, pure AsH3 (g) was placed in an empty, rigid, sealed flask at a pressure of 392.0 torr.

How do you do double replacement reactions?

A galvanic cell is powered by the following redox reaction: 3Br2 (l) + 2MnO2 (s) + 8OH^ (-) (aq) = 6Br^ (-) (aq) + 2MnO4^ (-) (aq) + 4H2O (l) a. Write a balanced equation for the half-reaction that takes place at the cathode. b.

The current federal agency responsible for safety-related issues of nuclear energy is the: A - Department of Energy B - Atomic Energy Commission C - Nuclear Regulatory Commission D - Environmental Protection Agency

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 * 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg. Its volume is 568 mL.

What is loamy soil?

What is the lowest possible value of n for a d atomic orbital?

List the following bonds in order of increasing ionic character: CsF, ClCl, BrCl, SiC