The number of years that must be invested at a rate of 7 % to earn$ 303.52 in interest is
8 years
<em><u>calculation</u></em>
- <em><u> </u></em><em>by use of the formula A = P (1+ rt) </em>
- <em> where : A is the final amount = 542 + 303.52 =$ 845.52</em>
<em> P is the principal money to be invested = $ 542</em>
<em> r= rate= 7/100=0.07</em>
<em> t= time required</em>
<em>=$ 845.52=$ 542( 1+ 0.07 t)</em>
- <em>open the bracket</em>
- <em>= $845.53= $542 + $37.94 t</em>
- <em>like terms together</em>
=$ 845.53 -$542 = $37.94 t
=$303.52 =$37.94 t
- divide both side by $37.94
= $303.52/ $ 37.94 = $37.94t/$37.94
t= 8 years
So you would do 12.99 / 4 which = about 3.25 per liter of gas
Based on the Hund's Rule, the three electrons in a 2p orbital are arranged as shown in option C.
<h3>What is an orbital?</h3>
The term orbital refers to a region in space where there is a high probability of finding the electron. We know that an electron in an atom could be defined by the use of four sets of quantum numbers which are;
- The principal quantum number
- The orbital quantum number
- The spin quantum number
- The magnetic quantum number
Hund's rule states that, electrons occur singly before pairing takes place. In this case, we can see that the only arrangement that obeys the Hund's Rule is option C.
Learn more about Hund's rule:brainly.com/question/12646067
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37.81%
The balanced equation for the reaction is
BaCl2 + MgSO4 ==> MgCl2 + BaSO4
So for every mole of MgSO4 consumed, 1 mole of BaSO4 should be produced. Let's calculate the molar mass of MgSO4 and BaSO4.
Atomic weight magnesium = 24.305
Atomic weight oxygen = 15.999
Atomic weight sulfur = 32.065
Atomic weight barium = 137.327
Molar mass MgSO4 = 24.305 + 32.065 + 4 * 15.999 = 120.366 g/mol
Molar mass BaSO4 = 137.327 + 32.065 + 4 * 15.999 = 233.388 g/mol
Moles BaSO4 = 0.9165 g / 233.388 g/mol = 0.003926937 mol
Mass MgSO4 = 0.003926937 mol * 120.366 g/mol = 0.472669699 g
% by mass of MgSO4 = 0.472669699 g / 1.2500 g = 0.378135759 =
37.8135759%
And since we only have 4 significant digits in our data, the result rounds to
37.81%
Answer:
when u rub a ballon on your head
Explanation:
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