Answer:
B
Explanation:
b/c air is not seen by eye
<span>Superconductors are materials that are able to conduct electricity especially well because they </span>do not have the resistance of most metals.
Answer: V= 4.2L
Explanation: To solve for the new volume we use Boyle's Law.
P1V1 = P2V2
Derive for V2 the new volume.
V2 = P1V1 / P2
V2 = 1.8 atm x 2.8 L / 1.2 atm
= 4.2 L
0.0015 kilometers is for sure the answer!
16 grams.
Looking at the reaction equation, it's evident that for each mole of HBr
consumed, 1 mole of CO2 will be produced. So let's calculate the molar mass
of HBr and CO2 first.
Atomic weight hydrogen = 1.00794
Atomic weight bromine = 79.904
Atomic weight carbon = 12.0107
Atomic weight oxygen = 15.999
Molar mass HBr = 1.00794 + 79.904 = 80.91194 g/mol
Molar mass CO2 = 12.0107 + 2*15.999 = 44.0087 g/mol
Moles HBr = 30 g / 80.91194 g/mol = 0.370773461 mol
Grams CO2 = 0.370773461 mol * 44.0087 g/mol = 16.317258 g
Rounding to 2 significant digits gives 16 grams.