The mass of ni(NO3)2 that dissolved in 25.0 ml of 0.100m ni(NO3)2 solution is calculated as follows
fin the number of moles = molarity x volume in liters
=25 x0.100/ 1000= 2.5 x10^-3 moles
mass = mass x molar mass
= 2.5 x10^-3 moles x 182.71 g/mol = 0.457 grams
1. NaCl
formula weight - 58,4 g/mol.
number of moles - 0,14 mol
mass - 58,4 g/mol · 0,14 mol = 8,176 g.
2. KCl
formula weight - 74,55 g/mol.
number of moles - 0,005 mol
mass - 0,372 g.
3. C₆H₁₂O₆
formula weight - 180,1 g/mol.
number of moles - 0,0056 mol
mass - 180,1g/mol · 0,0056 mol = 1,01 g.
4. NaHCO₃
formula weight - 84 g/mol.
number of moles - 0,0262 mol
mass - 2,2 g.
5. CaCl₂·H₂O
formula weight - 147 g/mol.
number of moles - 0,001 mol
mass - 0,15 g.
6. MgSO₄
formula weight - 120,3 g/mol.
number of moles - 0,0008 mol
mass - 0,096 g.
7. NaH₂PO₄·H₂O
formula weight - 138 g/mol.
number of moles - 0,001 mol
mass - 0,14 g.
Answer:
To help evenly distribute heat throughout the solution
Explanation:
The purpose of stirring a solution while being heated would be<u> to evenly distribute heat throughout the solution.</u>
<em>When a vessel containing a solution is heated, the molecules at the lower portion of the vessel get heated first before heat graduate radiates around the entire solution. Stirring the solution will ensure that the process of heat distribution around the entire solution is quickened.</em>
Stirring a solution while heating does not slow down the reactions that might occur in the solution, does not encourage sudden boiling of the solution, and neither does it prevent solute from dissolving into the solution.
Answer:
True
Explanation:
Elemental gold is a pure substance (if it is 24 carat). Gold used in jewelry is a mixture with such other metals as copper and nickel. Pure gold is rather soft, so it is mixed (alloyed) with other metals.