Answer:
Explanation:
a ) The temperature of water increases from 21.3°C to 48.4°C .
b ) Heat flow of water ( q) is positive because there is rise in temperature .
c ) The temperature of metal decreases from 99.3⁰C to 48.4⁰C .
d ) Heat flow of metal is negative because there is fall in temperature .
e ) heat loss of metal = heat gain by water
heat gain by water ( q ) = 50 x 4.2 x ( 48.4 - 21.3 )
= 5691 J
q = 5690 J . ( 3 significant figures )
heat loss of metal = mass x specific heat x fall in temp = 5691
150 x specific heat x ( 99.3 - 48.4 ) = 5691
specific heat = 5691 / (150 x 50.9 )
= .745 J / g C ( three significant figures )
Answer:
1.204 × 10²⁴ atoms
Explanation:
According to this question, one mole of aluminum (Al) atom contains 6.02 × 10²³ atoms.
If two moles of aluminum are given, this means that there will be 2 × 6.02 × 10²³ atoms of aluminum
2 × 6.02 × 10²3
= 12.04 × 10²³
= 1.204 × 10²⁴ atoms.
Answer:
3rd one
Explanation:
dont have one, i think just think it makes most sense
<h3><u>Answer;</u></h3>
A bond is formed, and the reaction is exothermic.
<h3><u>Explanation;</u></h3>
- An endothermic reaction takes more energy to break the bonds of the reactants than is released when the bonds of the products are formed.
- <em><u>Chemical bond formation is always an exothermic process and chemical bond breaking is an endothermic process. When bonds are formed the system loses energy and hence increases its stability.</u></em>
- In this case; Cl + Cl —> Cl2 + 58 kcal ; bond between two Cl atoms are being formed and thus the reaction is exothermic as it releases energy to the surrounding.
