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Questions in chemistry

[Terjawab] Consider the intermediate equations: [tex] \begin{array}{ll} C(s)+O_2(g) \rightarrow CO_2(g) & \Delta H_1=-393.5 kJ \\ 2 CO(g)+O_2(g) \rightarrow 2 CO_2(g) & \Delta H_2=-5660 kJ \\ 2 H_2 O(g) \rightarrow 2 H_2(g)+O_2(g) & \Delta H_3=483.6 kJ \end{array} [/tex] With the overall reaction: [tex]C(s)+H_2 O(9) \rightarrow CO(9)+H_2(9) \quad \Delta H_{ran}=?[/tex] What must be done to calculate the enthalpy of reaction? Check all that apply. * The first equation must be halved. * The first equation must be reversed. * The second equation must be halved. * The second equation must be reversed. * The third equation must be halved. * The third equation must be reversed. What is the overall enthalpy of reaction? [tex]\Delta H_{\text {rxn }}[/tex] = kJ

[Terjawab] A block of aluminum occupies a volume of 15.0 mL and has a mass of 40.5 g. What is its density? density = [?] g / mL

[Terjawab] Calculate (to 1 d.p.) the percentage mass in water, [tex]H_2O[/tex], of Oxygen

[Terjawab] If a 0.55 g piece of copper $( Cp =0.387 J / gC )$ at 100 C is placed in 50 g of water $( Cp =4.18$ $J / gC$ ) initially at 23 C , what would the final temperature of the mixture be?

[Terjawab] Hikers noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1.0 atm, the temperature is [tex]$25^{\circ} C$[/tex], and the volume of the bag is 0.985 L. At the top of the mountain, the temperature is [tex]$22^{\circ} C$[/tex] and the bag has puffed up to 1.030 L. What is the air pressure on top of the mountain? Type in your answer using the correct number of significant figures. Formula: [tex]$\frac{P_1 V_1}{T_1}=\frac{P_2 V_2}{T_2}$[/tex] [$\square$] atm

[Terjawab] A student requires 2.00 L of [tex]$0.100 M NH _4 NO _3$[/tex] from a [tex]$1.75 M NH _4 NO _3$[/tex] stock solution. What is the correct way to get the solution? Use [tex]$M_i V_i=M_i V_t$[/tex]. A. Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L. B. Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L. C. Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L. D. Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.

[Terjawab] What is a redox reaction? A. a process by which ATP molecules are transferred among molecules B. none of these C. a bad reaction to a night of partying D. a process by which electrons are passed from one molecule to another

[Terjawab] Select the correct answer. What is the mass percent of chlorine in chloroform $\left( CHCl _3\right)$ ? (The molar mass of $C =1201 H =1.0079$, and $Cl =35.45$.) A. $10.061 \%$ B. $29.698 \%$ C. $59.396 \%$ D. $89.094 \%$ E. $98.298 \%$

[Terjawab] Calculate the percentage mass of sulfur in sulfur dioxide, $SO_2$.

[Terjawab] Calculate the percentage mass of oxygen in sulfur dioxide, $SO_2$.