Exams & Certification

The change in internal energy of the combustion of solid naphthalene (C10H8) was determined to be equal to -5151 kJ/mol. Calculate its enthalpy of combustion. What is the change in internal energy of a system if the system evolves 525 J of heat and has 1.25 kJ of work done on it The correct answer […]

The standard enthalpy of combustion for naphthalene, C10H8(s), is -5156.8 kJ/mol. Using this data and the standard enthalpies of formation, ∆H: H2O(l) = -285.9 kJ mol; CO2(g)= -393.5 kJ mol, calculate the standard enthalpy of formation of C10H8(s), in kJ mol.a) +78.2kjb) +935.9 kJC) -1065.4 kJd) +3619.7 kJe) -10235.4 kj The correct answer and explanation

Which of the following is not Java Literal?Select one: a. Integer valueb. None of the abovec. Float valued. Character valuee. Boolean value The correct answer and explanation is : The correct answer is b. None of the above. Explanation: In Java, a literal is a constant value assigned directly in the source code. It represents

Some plant fertilizer compounds are HNO3, H2SO4, H3PO4, NH4NO3, and K2CO3. Which of these compounds contain both ionic and covalent bonds? (Select all that apply.) The correct answer and explanation is : To determine which of the plant fertilizer compounds contain both ionic and covalent bonds, we need to understand the nature of the bonds

What type of compound is H2SO4?Olonic saltacidorganic compoundcovalent molecule The correct answer and explanation is : The correct answer is acid. Explanation: H₂SO₄, known as sulfuric acid, is a strong acid. It is a chemical compound that consists of two hydrogen atoms (H₂), one sulfur atom (S), and four oxygen atoms (O₄). It is one

Total machine-hours: 32,700 Total fixed manufacturing overhead cost: $294,300 Variable manufacturing overhead per machine-hour: $2 Recently, Job T687 was completed with the following characteristics: Number of units in the job: 10Total machine-hours: 20Direct materials: $545 The correct answer and explanation is : To calculate the total manufacturing cost for Job T687, we need to consider

Cherry Corporation, a calendar year C corporation, is formed and begins business on 4/1/2023. In connection with its formation, Cherry incurs organizational expenditures of $52,700. Determine Cherry Corporation’s deduction for organizational expenditures for the current year. The correct answer and explanation is : To determine Cherry Corporation’s deduction for organizational expenditures, we need to consider

An Aluminum alloy component will undergo loading of 280MPa. From NDE measurements, we do know that the component has an internal crack of 10mm. Will the component fracture (fail)? The fracture toughness of Al has a value of 50MPa(m)1/2. We also know from previous data that the component failed when it contained a crack having

A 40 kVA, 6600/250 V single-phase transformer has the following parameters: Required: Calculate the full-load voltage regulation at a power factor of 0.08 lagging. Draw the phasor diagram representing the given transformer conditions. The correct answer and explanation is : Solution for Full-Load Voltage Regulation: To calculate the full-load voltage regulation at a given power factor (pf), we can use

what is the hybridization in XeOF4 is it sp3d2 or sp3d3 The correct answer and explanation is : The hybridization in XeOF₄ is sp³d². Explanation: To determine the hybridization, we need to consider the structure of XeOF₄ (xenon oxytetrafluoride). The central atom is xenon (Xe), which belongs to Group 18 of the periodic table. Xenon