Answer:
in illustration 1
the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.
while in
illustration 2
the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.
Explanation:
this is the reason
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide.
Answer:
![\boxed{-267.5}](https://tex.z-dn.net/?f=%5Cboxed%7B-267.5%7D)
Explanation:
You can calculate the entropy change of a reaction by using the standard molar entropies of reactants and products.
The formula is
![\Delta_{r} S^{\circ} = \sum_n {nS_{\text{products}}^{\circ} - \sum_{m} {mS_{\text{reactants}}^{\circ}}}](https://tex.z-dn.net/?f=%5CDelta_%7Br%7D%20S%5E%7B%5Ccirc%7D%20%3D%20%5Csum_n%20%7BnS_%7B%5Ctext%7Bproducts%7D%7D%5E%7B%5Ccirc%7D%20-%20%5Csum_%7Bm%7D%20%7BmS_%7B%5Ctext%7Breactants%7D%7D%5E%7B%5Ccirc%7D%7D%7D)
The equation for the reaction is
C₂H₄(g) + 3O₂(g) ⟶ 2CO₂(g) + 2H₂O(ℓ)
ΔS°/J·K⁻¹mol⁻¹ 219.5 205.0 213.6 69.9
![\Delta_{r} S^{\circ} = (2\times213.6 + 2\times69.9) - (1\times219.5 + 3\times205.0)\\\\= 567.0 - 834.5 = \boxed{-267.5 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}}](https://tex.z-dn.net/?f=%5CDelta_%7Br%7D%20S%5E%7B%5Ccirc%7D%20%3D%20%282%5Ctimes213.6%20%2B%202%5Ctimes69.9%29%20-%20%281%5Ctimes219.5%20%2B%203%5Ctimes205.0%29%5C%5C%5C%5C%3D%20567.0%20-%20834.5%20%3D%20%5Cboxed%7B-267.5%20%5Ctext%7B%20J%7D%5Ccdot%5Ctext%7BK%7D%5E%7B-1%7D%20%5Ctext%7Bmol%7D%5E%7B-1%7D%7D)
<span>they assign a numerical date to each rock layer studied.</span>