Answers
V(rms)² = (3RT)/M; where R is the molar gas constant, T is the temperature in Kelvin and M is the molar mass.
(1.12 x 10³)² = (3 x 8.314 x (273 + 15))/M
M = 5.72 x 10⁻³ kg = 5.72 grams
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Answers
The charge on the most stable ion of bromine is - 1.
What is an ion?
A charged atom or molecule is known as an ion. It has a charge because the atom or molecule's number of protons and electrons is not equal. Depending on whether an atom has more electrons than protons or fewer electrons than protons, an atom might become positively or negatively charged.
An atom is referred to be an ION when it is drawn to another atom due to an imbalance in its electron and proton numbers. A negative ion, or ANION, is an atom that contains more electrons than protons. A positive ion is one that has more protons than electrons.
Either there are too many or not enough electrons in a charged atom. Atoms in DS1 are heated to extremely high energy and unstable state. Then, a cathoderay in the thruster chamber discharges electrons, which strike the. Some of the electrons in the atoms in the chamber are stripped or knocked away when the electrons strike them. Plasma is created when a mass of charged, overheated atoms with free electrons.
Therefore, the charge on the most stable ion of bromine is - 1
Read more about ions, here
#SPJ2
Br (Bromide)
-1 or Br- hope this helps
Answers
The heat that is required to change the temperature of two cups of water (500 g) from room temperature (25◦C) to boiling
C) 157 kJ
Heat
Heat required= Mass of water x specific heat capacity of water x change in temperature of water required
Q=m* c* delta T
M = 500g
C = 4.184 g°C
Delta T = 100 - 25(room temp) = 75°C
Heat = 500 x 4.184 x 75
Heat = 156900 J
Heat = 156.9 KJ
Heat ~ 157.0 KJ (3.D.P)
Thus, the correct answer is C.
Learn more about "Heat":
Answer:
C
Explanation:
Heat required= Mass of water x specific heat capacity of water x change in temperature of water required
M = 500g
C = 4.184 g°C
Delta T = 100 - 25(room temp) = 75°C
Heat needed= 500 x 4.184 x 75
= 156900 J
= 156.9 KJ
~ 157.0 KJ (3.D.P)
Answers
Answer:
Molar concentration of Fe(NO3)3 . 9H2O = 0.12M
Explanation:
Fe(NO3).9H2O --> Fe(NO3)3 + 9H2O
By stoichiometry,
1 mole of Fe(NO3)3 will be absorb water to form 1 mole of Fe(NO3)3 . 9H2O
Therefore, calculating the mass concentration of Fe(NO3)3;
Molar mass of Fe(NO3)3 = 56 + 3*(14 + (16*3))
= 242 g/mol
Mass concentration of Fe(NO3)3 = molar mass * molar concentration
= 242 * 0.2
= 48.4 g/L
Molar mass of Fe(NO3)3 . 9H2O = 56 + 3*(14 + (16*3)) + 9* ((1*2) + 16)
= 242 + 162 g/mol
= 404g/mol
Concentration of Fe(NO3)3 . 9H2O = mass concentration/molar mass
= 48.4 /404
= 0.12 mol/l
Molar concentration of Fe(NO3)3 . 9H2O = 0.12M
B) 13 nM
C) 8.2 pM
D) 6.9 mM
Answers
Answer:
Binding affinity measures the strength of the interaction between a molecule to its ligand; it is expressed in terms of the equilibrium dissociation constant; and the higher value of this constant, the more weaker the binding between the molecule and the ligand is. On the other hand, small constans means that the interaction is tight. So "C" binds most tightly to the enzyme and "D" binds least tightly.
Mg+
O
Cl-
Na+
Answers
Answer:
Chlorine
Explanation:
Answer:
That would be the negative ion: Cl-.
Answers
Answer:
1.25 g
Explanation:
Now we have to use the formula;
N/No = (1/2)^t/t1/2
N= mass of cesium-137 left after a time t (the unknown)
No= mass of cesium-137 present at the beginning = 5.0 g
t= time taken for 5.0 g of cesium-137 to decay =60 years
t1/2= half life of cesium-137= 30 years
Substituting values;
N/5= (1/2)^60/30
N/5= (1/2)^2
N/5= 1/4
4N= 5
N= 5/4
N= 1.25 g
Therefore, 1.25 g of cesium-137 will remain after 60 years.