0.0048 mol PH3 consumed in 2.0 L container

0.0048 mol PH3 consumed in 2.0 L container

 

 

Consider the reaction

4PH3(g) → P4(g) + 6H2(g)

If, in a certain experiment, over a specific time period,

0.0048 mol PH3 is consumed in a 2.0 L container each second of reaction,

what are the rates of production of P4 and H2 in this experiment?

 

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Δ[P4]/Δt = –(1/4) (Δ[PH3]/Δt)

= 6.0×10^(-4) M/s

 

Δ[H2]/Δt = –(6/4) (Δ[PH3]/Δt)

= 3.6×10^(-3) M/s

 

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[키워드] 평균 반응 속도 기준, 평균 반응 속도 사전, 마이너스 부호 기준, 마이너스 부호 사전

 

 

 

 

 

Chlorite reduced by bromide 4.6×10^(-6) M/s

 

 

Chlorite is reduced by bromide in acidic solution

according to the following balanced equation:

ClO2^-(aq) + 4Br^-(aq) + 4H^+(aq)

→ Cl^-(aq) + 2Br2(aq) + 2H2O(l)

 

a) If Δ[Br2]/Δt = 4.6×10^(-6) M/s,

what is the value of Δ[ClO2^-]/Δt

during the same time interval?

 

b) What is the average rate of consumption

of Br^- during the same time interval?

 

Express your answer to two significant figures

and include the appropriate units.

 

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a) 답: 2.3×10^(-6) M/s

b) 답: 9.2×10^(-6) M/s

 

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[키워드] 평균 반응 속도 기준

 

 

반응형

 

 

oxidation of iodide ion by H3AsO4 4.8×10^(-4) M/s

 

 

The oxidation of iodide ion by arsenic acid, H3AsO4,

is described by the balanced equation

3I^-(aq) + H3AsO4(aq) + 2H^+(aq)

→ I3^-(aq) + H3AsO3(aq) + H2O(l)

 

a) If –Δ[I^-]/Δt = 4.8×10^(-4) M/s,

what is the value of Δ[I3^-]/Δt

during the same time interval?

Express your answer using two significant figures.

 

b) What is the average rate of consumption

of H^+ during that time interval?

Express your answer using two significant figures.

 

 

비소산(H3AsO4)에 의한 아이오딘화 이온의 산화는

다음 균형 반응식으로 기술된다.

3I^-(aq) + H3AsO4(aq) + 2H^+(aq)

→ I3^-(aq) + H3AsO3(aq) + H2O(l)

 

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a) 답: 1.6×10^(-4) M/s

b) 답: 3.2×10^(-4) M/s

 

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[키워드] 평균 반응 속도 기준

 

 

 

 

 

85.5% 인산(d 1.69, FW 97.99) 시약의 몰농도

85.5 wt% H3PO4(d 1.69, FW 97.99) 시약의 몰농도

 

 

흔히 인산(H3PO4, FW 97.99 g/mol)은

밀도가 1.69 g/mL인 85.5 wt% 수용액으로 시판된다.

H3PO4의 몰농도를 구하시오.

 

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답: 14.75 M

 

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[키워드] 85% 인산 기준, 85% 인산 몰농도 기준, 85% 인산 사전, 85% 인산 몰농도 사전, H3PO4 용액

 

 

 

 

 

120 g ethylene glycol in 450 g liquid

 

 

a) A container was found in the home of the victim that contained 120 g of ethylene glycol in 450 g of liquid. What was the percentage of ethylene glycol?

 

액체 450 g에 에틸렌 글라이콜 120 g이 들어있는 용기

 

 

b) If the toxic quantity is 1.5 g of ethylene glycol per 1000 g of body mass, what percentage of ethylene glycol is fatal?

 

유독량이 체중 1000 g당 에틸렌 글라이콜 1.5 g

 

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a) 답: 27%

b) 답: 0.15%

 

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[키워드] 질량 백분율 기준