Your answer is (4) 4, because the alpha particle is a helium nucleus (either an ion or an ejected particle from alpha decay), and it has a mass number of 4, being consisted of four nucleons, (2 protons and 2 neutrons).
Answer : 0.125 M
Explanation : The definition of osmotic pressure is "<span><em>the pressure can be applied on a pure solvent to prevent it passing into a given solution by osmosis</em>".
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So according to this definition, osmotic pressure can be called as directly proportional to the concentration of the solution and hence the pressure can also be directly proportional to the concentration.
Hence, if pressure is getting decreased from 28 to 7 it means it got decreased by 4 times;
28 / 7 = 4 that means;
So the concentration will be also decreased by 4 times so, 0.50 / 4 = 0.125 M
Exothermic
Explanation:
A chemical reaction that has ΔH of -2764Kj indicates that the reaction that took place was an exothermic reaction.
- The enthalpy changes accompanying a reaction causes heat changes.
- In an exothermic reaction, heat is usually liberated to the surroundings.
- The environment becomes hotter at the end of the reaction.
- It is assigned a negative value because the sum of the heat contents of products is less than that of reactants.
- A positive sign is for an endothermic reaction.
learn more:
Exothermic reactions brainly.com/question/10567109
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