In a heat engine, if 700 j of heat enters the system, and the piston does 400 j of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 j?

1,100 j

900 j

1,500 j

300 j

in a heat engine, if 500 j of heat enters the system, and the piston does 300 j of work, what is the final internal (thermal) energy of the system if the initial energy is 1,500 j?
1,700 j800 j1,300 j200 j

The energy is formed by the heat is called thermal energy. This energy is used in various industries such as power plants, paper mills, and etc

According to the question, the first law of thermodynamic is defined as:-

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic processes, distinguishing two kinds of transfer of energy, as heat and as thermodynamic

The data given in the question is,

From the first law of thermodynamics

Q = ΔU + W

For U2 the given data

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given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.