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mart [117]
3 years ago
9

When you light a fire place what energy transformation takes place

Chemistry
2 answers:
salantis [7]3 years ago
5 0
Kinetic energy is transformed into heat energy
DedPeter [7]3 years ago
3 0
Heat energy is released to warm the house
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A solution is formed by mixing 15.2 g KOH into
nikitadnepr [17]

Answer:

There are approximately 0.271\; \rm mol of formula units in that \rm 15.2\; g of \rm KOH (the solute of this solution.)

Explanation:

A solution includes two substances: the solute and the solvent. Note the solution here contains significantly more water than \rm KOH. Hence, assume that water is the solvent (as it is in many other solutions.)

The (molar) formula mass of \rm KOH is necessary for finding the number of moles of

  • One \rm K atom,
  • One \rm O atom, and
  • One \rm  H atom.

The formula mass of \rm KOH will thus be the sum of:

  • The mass of one mole of \rm K atoms,
  • The mass of one mole of \rm O atoms, and
  • The mass of one mole of \rm H atoms.

On the other hand, the mass (in grams) of one mole of atoms of an element is (numerically) the same as its relative atomic mass. The relative atomic mass data can be found on most modern periodic tables.

Relative atomic mass data from a modern periodic table:

  • \rm K: 39.098.
  • \rm O: 15.999.
  • \rm H: 1.008.

For example, the relative atomic mass of \rm K (potassium, atomic number 19) is 39.098 (3 sig. fig.) Hence, the mass of one mole of

The formula mass of \rm KOH is the sum of these three masses:

\begin{aligned}& M(\mathrm{KOH}) \\ &\approx 39.098 + 15.999 + 1.008 \\ &= 56.105\; \rm g \cdot mol^{-1}\end{aligned}.

The number of moles of \rm KOH formula units in this 15.2\; \rm g sample would be:

\begin{aligned}n &= \frac{m(\mathrm{KOH})}{M(\mathrm{KOH})} \\ &\approx \frac{15.2\; \rm g}{56.105\; \rm g \cdot mol^{-1}} \approx 0.271\; \rm mol \end{aligned}.

6 0
3 years ago
Name the following Structure:
nordsb [41]

Answer:

The correct answer is b) ethylmethylamine

Explanation:

This organic compound has the NH group (it is an amine), with 2 substitutions: a methyl group and an ethyl group.

8 0
3 years ago
Read 2 more answers
Gabe follows the directions to make chocolate chip cookies for his favorite Chemistry teacher. The recipe says it will make 24 c
Gemiola [76]

Answer:

71%

Explanation:

Theoretical Yield = 24

Actual Yield = 17

(Actual Yield/Theoretical Yield)*100% = (17/24)*100% ≈ 71%

7 0
3 years ago
What quantity is the same among atoms of the same element?
Vedmedyk [2.9K]

Answer:

Neutrons or Neutral atoms

Explanation:

Neutral atoms of each element contain an equal number of protons and electrons. The number of protons determines an element's atomic number and is used to distinguish one element from another.

8 0
2 years ago
If the force is 2,500 N and the acceleration is 500 m/s/s, what is the objects mass
ra1l [238]
The mass is 5kg
I hope this helps
5 0
2 years ago
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