A sample of sand initially at 22.2 °C absorbs 1364 J of heat. The final temperature of the sand is 67 °C. What is the mass (in g) of sand in the sample? The heat capacity of sand is 0.84

The mass of sand in the sample is 36.24 grams.

Explanation:

The equation used to calculate heat released or absorbed follows:

where,

q = heat absorbed = 1364 J

m = mass of sand = ?

c = heat capacity of sand = 0.84 J/g°C

= initial temperature = 22.2°C

= final temperature = 67°C

Putting values in above equation, we get:

Hence, the mass of sand in the sample is 36.24 grams.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml