Atomic mass Na = 22.99 u.m.a
22.99 g ------------------ 6.02x10²³ atoms
175 g -------------------- ?? atoms
175 x (6.02x10²³) / 22.99 => 4.58x10²⁴ atoms
hope this helps!
Answer:
CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal
Step-by-step explanation:
CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + 212 800 cal
The heat is on the right-hand side of the equation, so the reaction is releasing heat.
The reaction is <em>exothermic</em>.
A is <em>wrong</em>. Your sign of ΔH is wrong, because graphite is the more stable form of carbon. We must add energy to graphite to convert it to diamond, so the process is<em> endothermic</em>.
B and D are <em>wrong</em>, because a ΔH > 0 indicates an <em>endothermic</em> reaction.
Chemistry, geology, astronomy
Hydrogen bonds, electrostatic attractions, hydrophobic interactions, and Van der Waals attractions.