An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.
20
the answer is 25

mass number is 25

Explanation:

mass number is the number of proton and nuetron in an atom. Hence,

it is mathematically expressed as

mass number = proton + nuetron

mass number = 10+15=25

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.