There is not a force acting upon the book or the desk so nothing is moving it.
1) Chemical equation
H2 (g) + Br2 (g) ---> 2 HBr
2) molar ratios
1 mol H2 : 1 mol Br2 : 2 moles HBr
3) convert 30.0 g of H2 to number of moles
moles = mass in grams / molar mass = 30.0 g / 2.02 g/mol = 14.85 moles
4) calculate theoretical yield
2 moles HBr / 1 mol H2 = x / 14.85 moles H2
=> x = 14.85 moles H2 * 2 moles HBr / 1 mol H2 = 29.7 moles HBr
5) convert 59.52 moles HBr to mass
mass = number of moles * molar mass = 29.7 moles * 80.91 g /mol = 2403.03 g
6) percent yield = (actual yield / theoretical yield) * 100 = (85.00g / 2403.03g)*100 = 3.54%
Answer: 3.54%
A is the answer because different waves on the spectrum can create different magnitudes of disturbance.
Answer:
kcl and pb(ch3coo)2
The precipitate is PbCl2
Explanation:
Let us take the options provided one after the other;
In the first case, we have;
LiBr(aq) + NH4NO3(aq) ----> LiNO3(aq) + NH4Br(aq)
You can see that no precipitate is formed here.
In the second case;
2KCl(aq) + Pb(CH3COO)2(aq) ----> PbCl2(s) + 2CH3COOK(aq)
The precipitate here is PbCl2.
Answer:
See explanation.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to firstly recall the electron configuration of hydrogen:
To realize that the principal quantum number is 1, the angular is 0 as well as the magnetic one; therefore we infer that all the given n's are not allowed, just l=0 is allowed as well as ml=0 yet the rest, are not allowed.
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