Calculate the amount of heat (in kJ) released when 18.5 g or calcium hydroxide is formed. The molar mass of calcium hydroxide is 74.09g

CaO(s) + H2O(I) —> Ca(OH)2(s) + 65.2 kJ

A. 16.3 kJ
B 260.8 kJ
C 130.4 kJ
D 4.18 kJ

16.23 kj

Explanation:

Given data:

Mass of calcium hydroxide formed = 18.5 g

Molar mass of calcium hydroxide = 74.09 g/mol

Energy released = ?

Solution:

Chemical equation:

CaO + H₂O   →    Ca(OH)₂ + 65.2 Kj

Number of moles of Ca(OH)₂:

Number of moles = mass/ molar mass

Number of moles = 18.5 g/ 74.09 g/mol

Number of moles = 0.249 mol

when one mole of  Ca(OH)₂ formed 65.2 Kj energy is released.

When 0.249 moles formed energy released is,

0.249 × 65.2 kj = 16.23 kj

no, i was listening to water by schoolboy q while and i saw this question

explenation:

water isn't wet. wetness is a description of our experience of water; what happens to us when we come into contact with water in such a way that it impinges on our state of being. we, or our possessions, 'get wet'. a less impinging sense experience of water is that it is cold or warm, while visual experience tells us that it is green or blue or muddy or fast-flowing. we learn by experience that a sensation of wetness is associated with water: 'there must be a leak/i must have sat in something.'

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)