First one??
I believe this is the correct answer
Let suppose the Gas is acting Ideally, Then According to Ideal Gas Equation,
P V = n R T
Solving for P,
P = n R T / V ----- (1)
Data Given;
Moles = n = 1.20 mol
Volume = V = 4 L
Temperature = T = 30 + 273 = 303 K
Gas Constant = R = 0.08206 atm.L.mol⁻¹.K⁻¹
Putting Values in Eq.1,
P = (1.20 mol × 0.08206 atm.L.mol⁻¹.K⁻¹ × 303 K) ÷ 4 L
P = 7.45 atm
Answer:
A neutron is a subatomic particle with a mass comparable to a proton and a neutral electrical charge. A neutron is a subatomic particle with a mass of 1 and charge of 0. ... While the number of protons in a atom determines its element, the number of neutrons determines its isotope
Explanation:
thank me later:()
Answer: D. Amount of substance present in Avogadro‘s number of particles of the substance
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP, contains avogadro's number 
of particles and weighs equal to the molecular mass of that substance.
A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by 
.
particles
The reaction equation is:
Zn + Pb(NO₃)₂ → Pb + Zn(NO₃)₂
The moles of lead are calculated using:
moles = concentration x volume
moles = 0.25 x 0.15
moles = 0.0375
The moles of zinc are: 1 / 65 = 0.015
We see from the equation that equimolar quantities of zinc and lead should be present. Therefore, lead is in excess and zinc is the limiting reactant.
