Answer:
The pH range, reaction rate, accuracy and solubility are affected by the temperature.
Explanation:
Hello,
Temperature is factor affecting how solutions behave, thus, it could modify the pH range (change in color values) for an indicator in the presence of a base or an acid, since the kinetics behind the change of color is modified maybe decreasing or increasing the aforesaid range. Next, temperature usually increases the reaction rate, that's why the change in color could become faster or out of the proper change range. Then, in titration we use temperature-sensitive glassware which could expand due to high temperatures and subsequently turning out into wrong measurements. Finally, solubility is affected by the temperature, since the molecules are allowed to interact more effectively, that's we must make sure that they're completely dissolved at room temperature while titrating.
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Answer:
4.3 x 10⁶ kJ are released
Explanation:
From the balanced chemical equation we know that when 2 moles of hydrogen peroxide decompose, 191 kJ of heat are released. So what we need to calculate is the number of moles the 765 kg of H2O2 represent and calculate the heat released.
Molar Mass H2O2 = 34.01 g/mol
Mass H2O2 = 765 Kg x 1000 g/Kg = 765000 g
moles H2O2 = 1 Mol / 34.01 g x 765000 grams = 22.5 Mol
(-196.1 kJ/ 2 mol H2O2 ) x 22.5 mol H2O2 = -4.3 x 10⁶ kJ
Answer:
1) 3.0 moles.
2) 2.0 moles.
3) 2.0 moles of H atoms.
4) 4. 6.02 x 10²³.
Explanation:
<u><em>Q1: How many moles of chlorine are present in 3 moles of MgCI₂?</em></u>
- MgCl₂ is dissociated according to the equation:
<em>MgCl₂ → Mg + Cl₂.</em>
<em>Every 1.0 mole of Mg is dissociated to 1.0 mol of Mg and 1.0 mol of Cl₂.</em>
∵ 1.0 mol of MgCl₂ gives 1.0 mol of Cl₂.
∴ 3.0 mol of MgCl₂ gives 3.0 mol of Cl₂.
<em><u>Q2: How many moles of H₂0 are needed to produce 1 mole of O₂ in the following equation? 2H₂O → 2H₂ + O₂.</u></em>
- From the balnced equation:
<em>2H₂O → 2H₂ + O₂.</em>
2.0 moles of H₂O produce 2.0 moles of H₂ and 1.0 mole of O₂.
∴ We need 2.0 moles of H₂O to produce 1.0 mole of O₂.
<em><u>Q3: How many moles of hydrogen atoms are present in 1 mole of H2 gas?</u></em>
- H₂ is dissociated according to:
<em>H₂ → 2H.</em>
1.0 mol of H₂ is dissociated to produce 2 atoms of H.
∴ 1.0 mol of H₂ contains 2.0 moles of H atoms.
<u><em>Q4: How many atoms or molecules are in a mole?</em></u>
<u><em /></u>
- It is known that every mole of any compound contains Avogadro's number of atoms or molecules (6.022 x 10²³).
So, the answer is: 4. 6.02 x 10²³.
Answer: Plantar flexion
Explanation: can i have brainliest please
Answer:
189.75g
Explanation:
mass is equal to mole*molar mass and the molar Mass of KNO3 is 55 so 3.45*55 is equal to 189.75
