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oksano4ka [1.4K]
3 years ago
9

If, as a pioneer, you wished to warm your room by taking an object heated on top of a pot-bellied stove to it, which of the foll

owing 15-pound objects, each heated to 100°C, would be the best choice? The specific heat capacity (in J/g·K) for each substance is given in parentheses. Iron (0.450), copper (0.387), granite (0.79), gold (0.129), water (4.184).
Chemistry
1 answer:
jok3333 [9.3K]3 years ago
7 0

Answer:

Waterwould be the best choice

Explanation:

<em>The specific heat capacity</em> refers to how much energy is required to raise the temperature of an object. The higher the specific heat capacity, the more energy is required to heat a given substance. This would also mean that w<u>ith a higher specific heat capacity, a substance would be able to retain more heat</u>.

With the above statements in mind, water would be the best choice, because it would retain more heat than the other substances once it reaches 100 °C, and in turn water would emit the most heat while it cools.

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Read 2 more answers
An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the molarity, mola
Sonja [21]

Answer:

The molarity is 0.359\frac{moles}{L}

The molality is 0.354 \frac{moles}{kg}

The mass percent of the solution es 3.45%

Explanation:

Molarity is a unit of concentration that indicates the amount of moles of solute that appear dissolved in each liter of the mixture. It is determined by:

Molarity (M)=\frac{number of moles of solute}{volume}

Being:

  • K: 39 g/mole
  • N: 14 g/mole
  • O: 16 g/mole

The molar mass of KNO₃ is:

KNO₃=  39 g/mole + 14 g/mole + 3*16 g/mole= 101 g/mole

You can apply the following rule of three: if 101 grams of KNO₃ are present in 1 mole, 72.5 grams in how many moles are present?

moles of KNO_{3}=\frac{72.5 grams*1 mole}{101 grams}

moles of KNO₃= 0.718

So you have:

  • moles of KNO₃= 0.718
  • volume= 2 L

Applying this quantity in the definition of molarity:

molarity=\frac{0.718 moles}{2 L}

Molarity= 0.359\frac{moles}{L}

<u><em>The molarity is 0.359</em></u>\frac{moles}{L}<u><em></em></u>

Molality is a way of measuring the concentration of solute in solvent and indicates the amount of moles of solute in each kilogram of solvent.

Then the molality is calculated by:

Molality=\frac{moles of solute}{mass of solvent in kilograms}

Density is defined as the property that matter, whether solid, liquid or gas, has to compress in a given space. That is, it is the amount of mass per unit volume. So, if the density of 1.05 g / mL for the solution indicates that in 1 mL of solution there are 1.05 grams of solution, in 2000 mL (where 2L = 2000 mL, because 1 L = 1000mL) how much mass is there?

mass=\frac{2000 mL*1.05 grams}{1 mL}

mass= 2100 grams

Since mass solution = mass water + mass KNO₃

then mass water = mass solution - mass KNO₃

Being mass solution 2100 grams and mass KNO₃ 72.5 grams, and replacing you get: mass water= 2100 grams - 72.5 grams

mass water= 2,027.5 grams

Then, being:

  • moles of KNO₃= 0.718
  • mass of solvent in kilograms= 2.0275 kg (being 2,027.5 grams= 2.0275 kilograms because 1,000 grams= 1 kilogram)

Replacing in the definition of molality:

molality=\frac{0.718 moles}{2.0275 kg}

molality= 0.354 \frac{moles}{kg}

<u><em>The molality is 0.354 </em></u>\frac{moles}{kg}<u><em></em></u>

The mass percent of a solution is the number of grams of solute per 100 grams of solution. Then the mass percent is the mass of the element or solute divided by the mass of the compound or solute and the result of which is multiplied by 100 to give a percentage.

mass percent=\frac{mass of solute}{mass of solution} *100

So, in this case:

mass percent=\frac{72.5 grams}{2100 grams} *100

mass percent= 3.45 % KNO₃ by mass

<u><em>The mass percent of the solution es 3.45%</em></u>

3 0
3 years ago
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