In a circuit that has a total current of 4 amps with 4 lightbulbs wired in parallel, what is the current at each bulb?

1 A for each lamps

Explanation: we assume lamps are similar and lamps have same resistance.

Then current is divided according Kirchhoff s law equally to all lamps.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol