What is the change in internal energy ΔU for a system that releases 241J of heat and does 1.20kJ of work on the surroundings. Answer may be in J or kJ.

Explanation:

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In this case, since the first law of thermodynamics explains how the heat added to the system and the work done by the system equals the change in the internal energy of the system, we can write:

Next, since the system releases 241 J of energy (negative on the previous equation) and does 1.20 kJ (1200 J) of work, the change in the internal energy turns out:

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nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms