328 % means 0.328 g of KCN in 100 g of solution
0.328 g of KCN ---------> 100 g of solution
1120 * 10^-3 g of KCN ------> (100 / 0.328) * 1120 * 10^-3
= 341 g of solution
Answer:
Ionic compounds are crystalline solids, soluble in water and conduct electricity when molten or in solution. These characteristics are due to the type of link that holds them together.
Answer:
Hexane
Explanation:
These are hydrocarbons from the same group with general formula CnH2n+2.
So, the more molecular mass are (the more number of carbons) the higher boiling point will be.
Hexane has the most number of carbon atoms(6) , so the highest molecular mass and the highest boiling point.
Answer:
14.91 K.
Explanation:
- To solve this problem, we can use the following relation:
<em>Q = m.c.ΔT,</em>
where, Q is the amount of heat transferred to water.
m is the mass of the amount of water (m = 2.0 kg = 2000.0 g).
c is the specific heat capacity of water (c = 4.2 J/g.K).
ΔT is the change in temperature due to the transfer of butane burning.
- To determine Q that to be used in calculation:
Q from 4.000 g of butane is completely burned is - 198.3 kJ = 198300 J.
<em>The negative sign</em><em> symbolizes the the enthalpy change is </em><em>exothermic</em><em>, which means that </em><em>the</em><em> </em><em>energy is released</em><em>.
</em>
- Note that only 63.15% of the energy generated is actually transferred to the water.
∴ Q (the amount of heat transferred to water) = (198300 J)(0.6315) = 125226.45 J.
- Now, we can obtain the change in temperature:
∴ ΔT = Q/m.c. = (125226.45 J) / (2000.0 g)(4.2 J/g.K) = 14.9079 K ≅ 14.91 K.
<em>This means that the temperature is increased by 14.91 K.</em>
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Answer:
Pesticides. They are labelled to help identify their toxicity.