I believe it is A because a physical change is something that can be changed back to where a chemical change can not be such as burning something.
Answer: There are 0.523 moles of Titanium in atoms of Titanium
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.
To calculate the moles, we use the equation:
Answer : The boiling point of the solution is
Explanation :
Formula used for Elevation in boiling point :
or,
where,
= boiling point of solution = ?
= boiling point of water =
= boiling point constant of water =
m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= moles of solute (ethylene glycol) = 0.75 mole
= mass of solvent (water) = 1 kg
Now put all the given values in the above formula, we get:
Therefore, the boiling point of the solution is
Answer:
3.0 gram NaBr
Explanation:
A 5.0% aqueous solution of NaBr => 5 grams NaBr per 100 grams of solution
=> 0.05 gram NaBr per 1.0 gram of solution
=> grams of NaBr for 60g of 5% solution = 0.05·g·NaBr/g·Soln X 60g·Soln
= 3.0g NaBr