Questions are as follow, and answered one by one,
(1) What is step 1 in solving the problem?
Answer:
First of all moles of NaOH are calculated. This is done by applying following formula,
Moles = n = Mass / M.mass
(2) What is the molar mass of NaOH?
Answer:
Add all atomic masses of elements in NaOH to find the Molar mass.
Atomic Mass of Na = 22.98 g/mol
Atomic Mass of O = 16.00 g/mol
Atomic Mass of H = 1.008 g/mol
_______________
Molar Mass of NaOH = 39.988 g/mol
<span>(3) What is the Molarity of this solution?
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Answer:
Molarity = Moles / Vol
∴ Moles = 40g / 39.988g/mol = 1.0 mol
So,
Molarity = 1.0 mol / 6.0 L
Molarity = 0.16 mol.L⁻¹
Answer:
The heart is pumping more blood throughout your body
Explanation:
Answer:
a solution color becoming less intense due to dilution- is not an evidence of a chemical reaction
bubbles (gas formation) - evidence of a chemical reaction
explosion or fire - evidence of a chemical reaction
changes in color- evidence of a chemical reaction
precipitation- evidence of a chemical reaction
changes in temperature - evidence of a chemical reaction
a solid liquifying - is not an evidence of a chemical reaction
solution colors mixing - is not an evidence of a chemical reaction
Explanation:
A chemical change is not easily reversible and yields new substances. It is often accompanied by a loss or gain of heat.
In the answer section, i have shown some evidences that lead us to conclude that a chemical reaction has taken place. The occurrence of a chemical change often goes with the formation of new substances as earlier stated and any of these signs may accompany the process.
For instance, when a metal is dropped in dilute acid solution, bubble of hydrogen gas indicates that a chemical reaction has taken place.
Answer:
DMF is an aprotic polar solvent.
hence CN acts as a strong nucleophile in DMF to give SN2 reaction with the reactant resulting into inversion of configuration at stereo centers.
Explanation:
check the attached file for little explanation(diagram)