1 Answers
Call
Talk Doctor Online in Bissoy App
a ring made up of stainless-steel allow contains 11% chromium. What mass of chromium is found in a 9.43g ring
Mass of chromium is equal to 11% of the total mass. Therefore the mass of chromium = 0.11×9.43g=1.033g
1 Answers 1 views
What is the chemical reaction when ammonia is added in cobaltic ion (Co 3+) with an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d6 4s0 4p0
The reactivity of Co3+ with NH3 is illustrated showing effective catalysis for N–H dissociation to produce hydrogen applicable for designing ammonia fuel cells.
1 Answers 1 views
1.The half-life of chromium-51 is 28 days. If the initial amount of chromium-51 is 133 mCi, how much chromium-51 is left in the body after 84 days?
N(t)=Nо(1/2)^t/1/2tN(t)-remaining amount of substanceN(о)-Initial amount of the substanceN(t)=1/2*133mCi^84/1/2*28N(t)=133*1/2^6N(t)=133*1/64N(t)=133/64N(t)=2,078125 ~~ 2,08
1 Answers 1 views
an oxide of chromium is made up of 5.20 g chromium and 5.60 g oxygen what is the empirical formula of the oxide
Molar mass of chromium = 51.9961g/mol5.2/51.9961= 0.1Molar mass of oxygen = 15.9995.6/15.999= 0.35= Cr2O7
1 Answers 1 views
Arrange the following ions in order of increasing ionic radius: sulfide ion, chloride ion, potassium ion, calcium ion. Smallest Largest
Potassium ion, Sulfide ion, calcium ion, chloride ion
1 Answers 1 views
If the electronic configuration of calcium is [Ar]4s2 then what will be the electronic configuration of chromium and free dispositive mangnese ion ? Explain for 4 marks.
Answer: The electronic configuration of chromium is [Ar] 4s1 3d5 Perhaps a mistake in the word "mangnese" and it will be correct manganese The electronic configuration of manganese 2+ is...
1 Answers 1 views
What are the valence electrons for the following elements? A) 1s2 2s2 2p6 3s1 C) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 B) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 D)1s2 2s2 2p6 3s2 3p6
A. 1B.2C.3D.2
1 Answers 1 views
a dipositive ion has 16 protons ,then calculate the number of electrons in a trinegative ion.
neutral has 14 protons and 14 electrons and trinegative has 17 electrons
1 Answers 1 views
What is the mass percent composition of manganese and oxygen in the oxide?
Given: 3.144g of manganese reacts with oxygen to produce 6.348g of manganese oxide.
3,144 gr 6,348 gr xMn + yO =˃ MnxOy 55x 55x +16y 3,144×(55x+16y)=6,348 × 55x 172,92 x + 50,304y = 349,14x 50,304y=176,22x y=3,5x x=2 y=7 Answer: Mn2O7
1 Answers 1 views
The mole fraction of an aqueous solution of manganese(II) iodate is 0.266. Calculate the molarity (in mol/L) of the manganese(II) iodate solution, if the density of the solution is 1.48 g mL-1
Mn(IO3)2 = 405 g/mol.x 0.266 = 107.73 g H2O= 18 g/mol x 0.734 = 13.212 g.107.73+13.212 = 120.942 g.V= 120.942/1.48 = 81.72 ml / 1000 = 0.08172 L.Cm= n/V =...
1 Answers 1 views