Answer:
Option D is correct. MgO has a higher melting point because the ions have larger charges.
Explanation:
Magnesium oxide contains higher melting point compare to sodium chloride, because of its Mg2+, and O2- ions contain greater number of charges, and helping to form strong ionic bonds compare to Na+, and Cl- ions in Nacl.
That's why melting point of magnesium oxide is more than sodium chloride. MgO molecules bounded with each other with very high force known as electrostatic attraction present between negatively charge oxygen, and positively charge magnesium ions.
Answer:
There are 4,46x10e-4 moles of CaCl2 (0,000446 mol)
Explanation:
A molar solution indicates the amount of moles of solute (in this case CaCl2) in 1 liter of solution (1000ml).
1000ml -----0,105 mol CaCl2
4, 25 ml----x=(4,25 ml x0,105 mol CaCl2)/1000ml= 4,46x10e-4 mol CaCl2
Answer:
The answer should be, B, The periodic table
Answer:
We assume you are converting between moles NaOH and gram. You can view more details on each measurement unit: molecular weight of NaOH or grams This compound is also known as Sodium Hydroxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaOH, or 39.99711 grams.
Explanation: