Chemistry, 10.07.2019 03:30 suemmimonjaras8374

Consider a new temperature scale (ºa) based on the melting and boiling points of ammonia (nh3) which are taken as 0.0 ºa and 100.0 ºa, respectively. on the celsius scale ammonia melts at –77.7 ºc and boils at –33.3 ºc. find the temperature in ºa that corresponds to 25.0 ºc

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Answer from: demetriascott20

- 25.0 degree C corresponds to 231 ^0A .

Solution:- Let's say the two temperature scales have linear relationship. The equation of line is:

y=mx+c

where, m is the slope of the line and c is the intercept. Let's take the new temperature scale, ^0A for y and ^0C as . The equation would be looking as:

^0A=m*^0C+c

melting point of ammonia in new scale is 0.0 ^0A and in celsius scale it is -77.7 degree C. Boiling point in new scale is 100.0 ^0A and in celsius scale it is -33.3 degree C.

Let's plug in the values in the equation of line for melting points and boiling points to make two equations that we would solve:

For melting point:- 0.0=m(-77.7)+c

For boiling point:- 100=m(-33.3)+c

Now, we solve these two equations to find out the slope of the equation that is the value of m. Let's multiply the second equation by negative means changing all the signs from negative to positive and vice versa.

0.0=m(-77.7)+c

-100=m(+33.3)-c

---------------------------------------------

-100=-44.4m

$m=\frac{-100}{-44.4}$

m=2.25

Let's plug in this value of m in any of the two equations we have for melting point and boiling points to find out the value of intercept, c.

Let's say we use 0.0=m(-77.7)+c equation.

0.0=2.25(-77.7)+c

0.0=-174.825+c

c=174.825

Now, the first equation, ^0A=m*^0C+c could be written as:

^0A=2.25*^0C+174.825

We use this equation to convert the temperature of one scale to another.

We are asked to find the temperature in ^0A that corresponds to 25.0 ^0C .

Let's plug in the value of this degree C temperature in the above equation:

^0A=2.25(25.0)+174.825

= ^0A=56.25+174.825

= ^0A=231.075

This could be round to 231.

So, 25.0 degree C corresponds to 231 ^0A .

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

Ais the correct answer

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Consider a new temperature scale (ºa) based on the melting and boiling points of ammonia (nh3) which...

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