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Questions in chemistry

[Homework Help] 7. What is the equilibrium constant for the reaction [tex]PCl _3+ Cl _2 \leftrightarrow PCl _5[/tex] at [tex]$230^{\circ} C$[/tex], given that [tex]K =0.0205[/tex] for the reaction [tex]PCl _5 \leftrightarrow PCl _3+ Cl _2[/tex]?

[Homework Help] Which statement correctly describes the classification of chemical reactions into different categories? A. Not all reactions fit into a category, and a reaction can fit into only one category. B. All reactions fit into only one category. C. All reactions fit into a category, and a reaction can fit into only one category. D. Not all reactions fit into one category, and some reactions can fit into more than one category.

[Homework Help] 20) 13.74 L of hydrogen gas at [tex]$30.0^{\circ} C$[/tex] and 801 torr and 6.55 L of oxygen gas at [tex]$25^{\circ} C$[/tex] and 801 torr are drawn into a cylinder where the following reaction takes place. [tex]$2 H_{2(g)}+O_{2(g)} \rightarrow 2 H_2 O_{(g)}$[/tex] a. How many grams of water could be produced in this reaction? b. What is the limiting reactant? c. If 8.7 g of water are produced, what is the percent yield?

[Homework Help] A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical means. Based on this observation, how should the unknown substance be classified? A. mixture B. solution C. impure substance D. pure substance

[Homework Help] The incomplete table below shows selected characteristics of gas laws. | Name | Variables | Constants | Equation | |---|---|---|---| | ? | ? | ? | [tex]$P_1 V_1=P_2 V_2$[/tex] | | Charles's law | ? | ? | [tex]$\frac{V_1}{T_1}=\frac{V_2}{T_2}$[/tex] | | ? | temperature, pressure | ? | [tex]$\frac{P_1}{T_1}=\frac{P_2}{T_2}$[/tex] | | Combined gas law | pressure, temperature, volume | ? | ? | Which constants would most likely be filled in the first row of the table? A. temperature and moles of gas B. volume and temperature C. pressure and volume D. pressure and moles of gas

[Homework Help] \begin{tabular}{|c|c|c|} \hline Water & Carbon & Nitrogen \\ \hline Legchemical & & \\ \hline aquifers & & \\ \hline Infiltration & & \\ \hline urinelfects & & \\ \hline evaporation & & \\ \hline \end{tabular}

[Homework Help] Give any example of preparation of bis-arene by Fischer aluminium reduction method?

[Homework Help] Which ionic compound is used as a building material? A. salt B. limestone C. magnesium oxide D. iron oxide

[Homework Help] Nitrogen dioxide, $NO _2(g)$ ( $\triangle H_{ t }=33.84 kJ / mol$ ), is decomposed according to the following reaction: $2 NO_2(g) \rightarrow N_2(g)+2 O_2(g)$ What is the enthalpy change when 2.50 mol of nitrogen dioxide decomposes? Use $\Delta H_{p x D}=\sum(\Delta H_{\text {f, products }})-\sum(\Delta H_{f, \text { reactants }})$. A. 13.5 kJ of energy released B. 13.5 kJ of energy absorbed C. 84.6 kJ of energy released D. 84.6 kJ of energy absorbed

[Homework Help] Match the following: 12. Column-I (a) Ideal gas law (b) Avogadro gas law (c) Boyle's temperature (d) 22.7 L at STP Column-II (p) V ∝ n (q) PV = nRT (r) Molar volume of ideal gas (s) Gas follows ideal gas equation 13. Column-I (a) Ideal gas isotherm (b) Ideal gas Temp is increased by (c) Real gases deviate from ideal gases (d) 2 Mol of ideal gas at 540 K is 44.8 L, its P is Column-II (p) Plot of V at const T (q) Increasing P and M and V constant (r) because of attraction of molecules (s) 2 atm