When the amount of heat gained = the amount of heat loss
so, M*C*ΔTloses = M*C* ΔT gained
when here the water is gained heat as the Ti = 25°C and Tf= 28°C so it gains more heat.
∴( M * C * ΔT )W = (M*C*ΔT) Al
when Mw is the mass of water = 100 g
and C the specific heat capacity of water = 4.18
and ΔT the change in temperature for water= 28-25 = 3 ° C
and ΔT the change in temperature for Al = 100-28= 72°C
and M Al is the mass of Al block
C is the specific heat capacity of the block = 0.9
so by substitution:
100 g * 4.18*3 = M Al * 0.9*72
∴ the mass of Al block is = 100 g *4.18 / 0.9*72
= 19.35 g
There are electrons between the carbon and oxygen atoms.
The electrons have a negative charge. The nuclei of the atoms are positively charged.
The electrical attraction between oppositely charged particles keeps the electrons between the atoms.
<span>0.496 g of NaOH required
3 pellets.
First, determine the molar mass of NaOH.
Atomic weight sodium = 22.989769
Atomic weight hydrogen = 22.989769
Atomic weight oxygen = 15.999
Molar mass NaOH = 22.989769 + 22.989769 + 15.999 = 61.978538 g/mol
Now determine how many moles of NaOH we need. Multiply desired volume by desired molarity. So
0.200 l * 0.040 mol/l= 0.008 mol
To get the mass, then multiply by the molar mass, so
0.008 mol * 61.978538 g/mol = 0.495828304 g
Since we have the NaOH in pellet form, divide the desired mass by the mass of each pellet. So
0.495828304 g / 0.170 g/pellet = 2.916637082 pellets
You'll need 3 pellets.
To get closer to the desired molarity, I would recommend increasing the amount of solution being prepared if you can accurately measure the larger volume.</span>
Yes; every object has energy and you cannot create or destroy energy but you can transfer it.
We know the formula of the density:
ρ =
;
So the mass will be equal to:
m = ρ * V = 2.70 * 21.3 = 57,51 g =
57510 mg of substance.
So the answer is 57510.
