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Mama L [17]
3 years ago
15

75 POINTS!!!

Chemistry
2 answers:
kap26 [50]3 years ago
6 0

Answer:

here

https://www.sciencea-z.com/science/resource/SL_Gr_3_Effects_of_Forces_L4_all_printable_resources.pdf

hope that helps

Nikolay [14]3 years ago
6 0

Answer:

i dont know

Explanation:

help me god

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When 21.45 g of KNO3 was dissolved in water in a calorimeter, the temperature fell from 25.00°C to 14.14 °C. If the heat capacit
pashok25 [27]

25.9 kJ/mol. (3 sig. fig. as in the heat capacity.)

<h3>Explanation</h3>

The process:

\text{KNO}_3\;(s) \to \text{KNO}_3\;(aq).

How many moles of this process?

Relative atomic mass from a modern periodic table:

  • K: 39.098;
  • N: 14.007;
  • O: 15.999.

Molar mass of \text{KNO}_3:

M(\text{KNO}_3) = 39.098 + 14.007 + 3\times 15.999 = 101.102\;\text{g}\cdot\text{mol}^{-1}.

Number of moles of the process = Number of moles of \text{KNO}_3 dissolved:

\displaystyle n = \frac{m}{M} = \frac{21.45}{101.102} = 0.212162\;\text{mol}.

What's the enthalpy change of this process?

Q = C\cdot \Delta T = 0.505 \times (25.00 - 14.14) = 5.4843\;\text{kJ} for 0.212162\;\text{mol}. By convention, the enthalpy change \Delta H measures the energy change for each mole of a process.

\displaystyle \Delta H = \frac{Q}{n} = \frac{5.4843\text{kJ}}{0.212162\;\text{mol}} = 25.8\;\text{kJ}\cdot\text{mol}^{-1}.

The heat capacity is the least accurate number in these calculation. It comes with three significant figures. As a result, round the final result to three significant figures. However, make sure you keep at least one additional figure to minimize the risk of rounding errors during the calculation.

4 0
3 years ago
Chemistry course is intended for what type of students?
yulyashka [42]

Answer:

Chemistry course is intended for students who did not take chemistry in high school or who struggled with high school chemistry.

Explanation:

4 0
3 years ago
Which type of bond is present in hydrogen sulfide (H2S)? The table of electronegativities is given
LuckyWell [14K]

Bonds formed between atoms can be classified as ionic and covalent

Ionic bonds are formed between atoms that have a high difference in the electronegativity values.

In contrast, bonds formed between atoms that have a difference in electronegativity lower than the ionic counterparts are polar covalent bonds.  If the atoms have very similar electronegativities, they form non-polar covalent bonds.

In H2S, the S atom is bonded to 2 H atoms. The electronegativity of H = 2.2 and S= 2.56. Since the difference is not high the bond formed will be covalent (polar covalent).

7 0
4 years ago
Read 2 more answers
1.12 g of iron combines with 0.48 g of oxygen to form an oxide of
MArishka [77]

Answer:

OZ2 is the oxygen and DY5 is Dynamite

Explanation:

8 0
2 years ago
The inner planets—Mercury, Venus, Earth, and Mars—are believed to have been formed by _____.
larisa86 [58]

i believe the answer is B :/

4 0
3 years ago
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