Answer:
569K
Explanation:
Q = 3.5kJ = 3500J
mass = 28.2g
∅1 = 20°C = 20 + 273 = 293K
∅2 = x
c = 0.449
Q = mc∆∅
3500 = 28.2×0.449×∆∅
3500 = 12.6618×∆∅
∆∅ = 3500/12.6618
∆∅ = 276.4220
∅2 - ∅1 = 276.4220
∅2 = 276.4220 + ∅1
∅2 = 276.4220 + 293
∅2 = 569.4220K
∅2 = 569K
As you know
<span>d=v .t</span>
We need to find the distance traveled in 5.4 hout for q car.
<span>d=v×t
=120km/h×5.4h
=648km
so, the total disctance of the car 1 on 35 liters is 648 km</span><span>
45L=648km
</span>To get the Value for 1 Liter Divide both sides with 45 and you get
<span><span><span><span>45L/</span>45L</span>=<span>648/45L
</span>=14.4km/L</span></span>
The gold foil experiment by Ernest Rutherford proved that the positive charge of an atom is located in the nucleus, the small region that contributes most to the mass of the atom. Most of the atom is empty space, but the nucleus, however small, dictates the mass of the atom.
Answer: The correct option is d.
Explanation: Antoine Lavoisier is a french scientist who discovered the role of oxygen in the process of combustion and respiration.
He was famous for the law of conservation of mass.
This law states that the total mass the reactant will equal to the total mass of the products in a chemical reaction.
For example: Combustion of methane
Mass of the reactants = ![[12+4(1)]+[2(32)]=80g/mol](https://tex.z-dn.net/?f=%5B12%2B4%281%29%5D%2B%5B2%2832%29%5D%3D80g%2Fmol)
Mass of the products = ![[12+2(16)]+2[2(1)+16]=80g/mol](https://tex.z-dn.net/?f=%5B12%2B2%2816%29%5D%2B2%5B2%281%29%2B16%5D%3D80g%2Fmol)
Hence, every chemical reaction will follow law of conservation of mass.
Answer: 2.67 moles of Phosphine are produced
Explanation:
From the equation 3H2 + P2 → 2PH3
3 moles of hydrogen (H2) = 2 moles of Phosphine (PH3)
4 moles of hydrogen = X moles of PH3
Then, cross multiply
X moles of Phosphine = (4 x 2) / 3
= 8 / 3
= 2.67 moles
Thus, 4 moles of hydrogen produces 2.67 moles of Phosphine
