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alyssahockett4
27.11.2019 •
Chemistry
Which of the following processes have a ? s > 0?
2hcl(g) ? h2(g) + cl2(l)
2nh3(g) + co2(g) ? nh2conh2(aq) + h2o(l)
lithium fluoride forms from its elements
cesium chloride dissolves in pure water
all of the above processes have a ? s > 0
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Ответ:
Cesium chloride dissolves in pure water has
> 0.
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
a)![2HCl(g)\rightarrow H_2(g)+Cl_2(l)](/tpl/images/0392/4451/61c3f.png)
As 2 moles of gas are converting to 1 mole of gas and 1 mole of liquid, the randomness decreases and hence
is negative.
b)![2NH_3(g)+CO_2(g)\rightarrow NH_2CONH_2(aq)+H_2O(l)](/tpl/images/0392/4451/22f3f.png)
As gas molecules are converting into aqueous and liquid form, the randomness decreases and hence
is negative.
c) lithium fluoride forms from its elements:![2Li+F_2\rightarrow 2LiF](/tpl/images/0392/4451/97417.png)
As elements are combining to form a compound, the randomness decreases and hence
is negative.
d) Cesium chloride dissolves in pure water :![CaCl_2(s)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)](/tpl/images/0392/4451/b5486.png)
As compound is dissociating into ions, the randomness increases and hence
is positive.
Ответ:
Factors such as surface area, rock composition, and location influence the rate of weathering. water, the faster the rock will break down. A greater surface area allows chemical weathering to affect more of a rock. Rock Composition Different kinds of rock break down at different rates.
Explanation:
HOPE THIS HELPS HAVE A GOOD DAY.