How many moles of hydrogen are in 50.0 l of hydrogen gas at stp? 1.39 moles 2.23 moles 0.985 moles 2.74 moles 4.56 moles?

What is the relationship between the values of wavelength, frequency, and energy of electromagnetic waves

Write a complete, balanced equation for this double displacement reaction between sodium hydroxide and nickel (ii) chloride. (hint: the solid is a compound of ni2 + ions and hydroxide ions.

A 22.4 liter sample of gas at stp weighs 12.0 grams. What is the molecular weight of the gas

When electrical energy is "used" by an electric light, what really happens to the energy? It changes to matter. It is given off as other forms of energy. It stops at the electric light. It disappears.

Q: what are the mass number and charge of an electron, respectively?

Is sidewalk cement an element or a compound?

1.4 Explain why it is important to support individuals to challenge information about services that may present a barrier to participation

Which describes energy changes during nuclear fission? A very large amount of energy is produced from a tremendous mass. EEUU A very large amount of energy is produced from a very small mass. G .

A 0.75mol calcium carbonate (CaCO3) pellet has what mass?

The pH of the acid in the stomach is 2. When a person has heartburn, the acid in their stomach is coming up the esophagus (lower throat) and burning the lining of the esophagus. Why would a person take an Alka Seltzer tablet for heartburn?