Answer:
Explanation:
<u>1) Data:</u>
a) mass of solute = ?
b) volume of solution = 1.25 liter
c) M = 2.92 mol/liter
d) solute NaOH
<u>2) Formulae:</u>
<u />
a) Molarity, M = number of moles of solute / volume of solution in liters
b) mass in grams = molar mass × number of moles
<u>3) Solution:</u>
a) <u>Calculate number of moles of solute</u>:
- M = number of moles of solute / volume of solution in liters
⇒ number of moles of solute = M × volume of solution in liters
⇒ number of moles of solute = 2.92 mol/liter × 1.25 liter = 3.65 mol
b) <u>Molar mass of NaOH = 39.997 g/mol </u>(you can take this number from internet or calculate it using the atomic masses of Na, O, and H).
c) <u>Calculate the mass of solute:</u>
- mass in grams = molar mass × number of moles = 39.997 g/mol × 3.65 mol = 145.98905 g = 146. g
The answer must be reported with 3 significant figures, so it is 146. g.
Answer:
mass = 2.65 [nearest hundredth].
Explanation:
Mass = Density / Volume
mass = 1000 / 376.8
mass = 2.653927813163.. ≈ 2.65
Neutralization reaction means the reactants must be one acid and one alkali, and the product will be H2O and metal salt.
The only one satisfying this will be B
As you move down a group, first ionization energy decreases. Electrons are further from the nucleus and thus easier to remove the outermost one
<em>15. Metallic bonds form between?</em>
Answer 15 : cations and electrons.
<em>16. What is the formula for lithium nitride?</em>
Answer 16 : Li₃N
<em>17. Which type of solid is likely to be the best conductor of electricity?</em>
Answer 18 : metal element.
<em>18. When an atom gains an electron, it forms a?</em>
Answer 18 : an anion.
<em>19. Mg₃P₂ - Which element is the cation? </em>
Answer 19 : Mg⁺⁺
<em>20. Which of the following has the highest melting point?</em>
Answer 20 : metallic compound.
<em>21. What statement is true about carbon-12 and carbon-14?</em>
Answer 21 : They are isotopes of carbon.
<em>22. What is the name of the phase change that occurs when a substance changes from a gas to a liquid?</em>
Answer 22 : Condensation
Hope this helps!