Moles= mass divided by Molecular mass
Moles= 251.4 divided by 84
Moles=2.99
Rounded up is 3
Explanation:
Upon dissolution of KCl heat is generated and temperature of the solution raises.
Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.
= 4.31 kJ
or, = 4310 J (as 1 kJ = 1000 J)
Mass of solution will be the sum of mass of water and mass of KCl.
Mass of Solution = mass of water + (no. of moles of KCl × molar mass)
= 200 g +
= 200 g + 13.625 g
= 213.625 g
Relation between heat, mass and change in temperature is as follows.
Q =
where, C = specific heat of water =
Therefore, putting the given values into the above formula as follows.
Q =
4310 J =
Thus, we can conclude that rise in temperature will be .
Answer:
<h2>
☆ <u>Hi</u> <u>Friend</u>! ☆</h2>
<h2>____________________</h2><h3 /><h2>☆ <u>Define</u> <u>Base</u></h2>
<h3>▪ Any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of indicators (e.g., turns red litmus paper blue)</h3>
<h3>▪ Also bases are bitter in taste.</h3>
<h2>____________________</h2>
<h2>☆ <u>All</u> <u>Alkali</u> <u>are</u> <u>base</u><u> </u><u>but</u> <u>all</u> <u>bases</u> <u>are</u> <u>not</u> <u>alkali</u>. <u>Explain</u>.</h2>
<h3>▪ Main difference is that bases that dissolve in water are called alkalis and bases that don't dissolve in water are only bases not alkalis, so we can say all bases are not alkali but all alkalis are bases.</h3>
<h2>____________________</h2>
Answer:
when population increases the amount of carbon dioxide also increases as population use oxygen and release carbon dioxide