How many mol of hydrogen are needed to double the volume occupied by 0.34 mol of hydrogen,

assuming no changes in pressure or temperature? Enter your answer in the provided box.

Some chemists believe that satisfaction of the octet rule should be the top criterion for choosing the dominant lewis structure of a molecule or ion. other chemists believe that achieving the best formal charges should be the top criterion.

Explain the processes of convergence and divergence

2. Explain how the skeletal system protects the nervous system.

What is the percent by mass of water in iron (ii) sulfate heptahydrate, feso4•7h2o (or what percent of the molar mass of feso4•7h2o is due to the waters of crystallization) ?

Which statement describes acids

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster

A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 755 torr and the water vapor has a partial pressure of 24 torr. What amount (in moles) of hydrogen gas is contained in 1.55 L of this mixture at 298 K?

Both equation I and II are balanced, but equation II is the correct way to write the balanced equation. Why do you think this is? (Hint: Think fractions.) I) 2 SnO2 + 4 H2 → 2 Sn + 4 H2O II) SnO2 + 2 H2 → Sn + 2 H2O

If some of the salt remains adhered to the weighing paper (and therefore is not transferred to the calorimeter), will the enthalpy of solution for the salt be reported too high or too low?