Answer:
Either OB or OC. However, it's asking how to RECORD the notes not measure them so it would be OB. If it's multiple choice choose both.
Explanation:
Answer:
molar mass CO = 28.01 g/mol
3.45 x 10^2 x 28.01 =9.66 x 10^3 g
mass Zn = 2.45 x 10^-2 x 65.39 g/mol=1.60 g => 1.60 x 10^0
Explanation:
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Answer:
B
Explanation:
I did this and got it correct.
Co is the symbol for element cobalt. Atomic number of Co is 27.
1st shell has s orbital and can hold up to 2 electrons.
2nd shell has s and p orbital and can hold upto 8 electrons
3rd shell has s, p and d orbital and can hold upto 18 electrons
In Co electronic configuration upto p orbital in 3rd energy shell is
1s² 2s² 2p⁶ 3s² 3p⁶
After 3p orbital, electrons start filling in the s orbital in 4th energy shell as 4s orbital has lower energy than 3d therefore it fills 4s before 3d, after it fills 2 electrons in 4s, remaining electrons fill 3d orbital
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
in the 3d subshell there are 7 electrons
Answer:
12.01% by mass
Explanation:
Percent by mass is 100 times the mass of solute (ammonia) over the mass of the solution. In molarity, we have the moles of ammonia per liter of solution. There are 6.70moles of NH3 in 1L. Thus, we need to convert the moles of ammonia to grams and the liters of solution to grams:
<em>Mass ammonia - Molar mass: 17.031g/mol-</em>
6.70moles * (17.031g / mol) = 114.1g NH₃
<em>Mass solution:</em>
1L * (1000mL / 1L) = 1000mL * (0.950g/mL) = 950g
Percent by mass:
114.1g NH₃ / 950g * 100 =
<h3>12.01% by mass</h3>