What's the volume of 7 mol of hydrogen at STP

Why is hydrogen a light gas and iron is a heavy solid

If the concentration of brown sand is 2.0 ppm, how many grains of brown sand are in the bucket?

Which layer of the earth holds the asthenosphere? crust mantle inner core outer core

In the reaction 2H2 + O2 → __H2O, what coefficient should be placed in front of H2O to balance the reaction? A-1 B-2 C-3 D - no coefficient is needed

A 14.0 gram sample of iron is initially at 414.0 °C. It loses 186.0 J of heat to its surroundings. What is its final temperature?

Select all correct answers. In the cathode ray tube experiment, J. J. Thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field.

if 5.50 mol of calcium carbide (CaC 2) reacts with an excess of water, how many moles of acetylene (C 2 H 2), a gas used in welding, will be produced? CaC2 (s) + 2H2O (l) Ca (OH) 2 (aq) + C2H2 (g)

Jamal was riding his bike home at a speed of 12 mph. On his trip out, he had travled. 8 miles away from his house. He has been travleing for a half hour at this speed

3. Which means of particle transport requires input of energy from the cell? diffusion osmosis facilitated diffusion active transport

Which best describes a spontaneous process as it relates to the second law of thermodynamics? It destroys heat. It requires work. It creates energy. It occurs naturally.