3 years ago

How can you get unconscious

Chemistry

1 answer:

sesenic [268]3 years ago

6 0

When sudden changes occurs in the body. lack of blood flow in the brain

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What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?

inessss [21]

Radioactive material obeys 1st order decay kinetics,
For 1st order reaction, we have
k = $\frac{2.303}{t}Xlog \frac{\text{initial conc.}}{\text{final conc.}}$
where, k = rate constant of reaction

Given: Initial conc. 100, Final conc. = 6.25, t = 18.9 hours

∴ k = $\frac{2.303}{18.9} X log \frac{100}{6.25}$ = 0.1467 hours^(-1)

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3 years ago

At equilibrium, no chemical reactions take place. true or false

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3 years ago

How many liters of N2 are needed to react with 92 g of K, at STP, according to the following reaction? (Balance equation first.)

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2 years ago

Given: N2H4(l) + O2(g) LaTeX: \longrightarrow⟶ N2(g) + 2H2O(g) ΔH°1 = –543 kJ·mol–1 2H2(g) + O2(g) LaTeX: \longrightarrow⟶ 2H2O(

kakasveta [241]

Answer:

Explanation:

Given reaction

N₂H₄ + O₂ ⇒ N₂ + 2H₂O ΔH₁ = -543 KJ ---------- ( 1 )

2H₂ + O₂ ⇒ 2H₂O ΔH₂ = -484 KJ ---------- ( 2 )

N₂ + 3 H₂ ⇒ 2NH₃ ΔH₃ = -92 KJ -----------( 3 )

( 1 ) - ( 2 ) +( 3 )

N₂H₄ + O₂ - 2H₂ - O₂ +N₂ + 3 H₂ ⇒ N₂ + 2H₂O - 2H₂O +2NH₃

ΔH = -543 + 484 -92 = -151 KJ

N₂H₄ + H₂ ⇒ 2NH₃ ΔH = -151 KJ .

2NH₃ ⇒ N₂H₄ + H₂ ΔH = + 151 KJ

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2 years ago