How far is the milkyway to the earth

You have a series of four chemical reactions (1->2->3->4). How do you calculate the triangleH2 if you know the other triangleH values? A. Triangle H2 = triangleH1 + triangleH3 - triangleH4 B. Triangle H2 = triangleH1 + triangleH3 + triangleH4 C.

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar side, the water was liquid. Twelve hours later, the water had changed phase and was a gas.

1) How many aluminum atoms are there in 3.50 grams of Al2O3? (a) 2.45 x 1022 (b) 2.07 x 1022 (c) 1.68 x 1022 (d) 4.90 x 1022 (e) 4.13 x 1022

A student mixes 86.3 g of water at 50.3°c with 60.9 g of water at 16.7°c in an insulated flask. what is the final temperature of the combined water?

What is the first man made organic compound synthesized in laboratory?

Express (3 x 104) (4 x 1023) in scientific notation

Use Dimensional Analysis: convert: 0.36km/sec to m/min 2.6L to cm^3 9cm to mm 7.6mm^3 to cm^3

Something occurs when a liquid changes to a gas below its surface as well as on the surface

What happens to the reaction c2h6 + 137 kj when the temperature of the reaction is increased?