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?

Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 g/cm3. A fitting composed of common brass has a total volume of 112.5cm^3. How many atoms of copper and zinc does the fitting contain?

What happens when the water sand mixture is poured through a filter?

Use the problem below to answer the question: How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is: C + H2O → CO + H2 The equation is balanced. The starting substance is carbon, C.

The volume and shape of a solid could be changed by

What are the elements in group 3-12 called

A student labels two 250 milliliter beakers with the letters A and B. She puts 100 milliliters of water in each of them. She adds some salt to beaker A and stirs until the salt dissolves completely.

What elements on the periodic table are most likely to form molecular compounds?

Is flammability a form of chemical change or physical change

Lipid bilayers:A. depend on hydrophobic interactions to arrange the polar head groups together in the interior of the bilayer. B. contain fatty acids that are immobile. C. are found only in eukaryotes. D.

The fictional character of sherlock holmes was created by