C. freezes
Pure water freezes at 273 Kelvin<span> and boils at </span>373 Kelvin<span>.</span>
Answer:
10 neutrons
Explanation:
The mass number is equivalent to the protons + neutrons so...
18 - 8 = 10 neutrons
Hey there!
Molar mass Na2SO4 = <span>142.04 g/mol
Number of moles:
n = m / mm
n = 25 / 142.04
n = 0.176 moles of Na2SO4
Therefore, </span>use the Avogadro constant
1 mole Na2SO4 ------------------- 6.02x10²³ molecules
0.176 moles Na2SO4 ------------ molecules ??
0.176 x ( 6.02x10²³ ) / 1
=> 1.059x10²³ molecules of Na2SO4
hope this helps!