Answer:
<h2>15.72 cm³</h2>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula
From the question we have
mass = 45.6 g
density = 2.9 g/cm³
We have the final answer as
<h3>15.72 cm³</h3>
Hope this helps you
Answer:
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... As a result, the particles take up more volume.
Let's hope she didn't watch it without me or i will never be speaking to her again :))
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:
The solubility of a substance can be increased by increasing the amount of solvent in a solution.
Explanation:
Two ways by which the rate of dissolving for substance can be increased.
1 By increasing the temperature of the solution: Increase in temperature will in turn increase the entropy or disorder or randomness of the solute molecules in a solution thus increasing the rate of dissolving the substance in that solution.
2 By increasing the volume of the solution : increase in the volume of the solution by adding more solvent can also increase the dissolving rate of a specific substance in a solution.
