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Oliga [24]
3 years ago
7

there is a bell at the top of a tower that is 50 m high. The bell weighs 190N. the bell has _____________energy. Calculate it

Chemistry
1 answer:
Sedbober [7]3 years ago
4 0

Answer:

9,500J

Explanation:

Distance= 50m

Force = 190N

Energy = Force x distance

= 190 x 50

= 9,500J

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Different isotopes of the same element must have a different
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they must have same atomic number and different atomic mass

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If gas in a sealed container has a pressure of 50 kPa at 300 K, what will the pressure be if the temperature rises to 360 K?
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Which hold more heat for longer period of time ? <br><br> A. Air <br> B. Water
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Consider the balanced equation of K I KI reacting with P b ( N O 3 ) 2 Pb(NOX3)X2 to form a precipitate. 2 K I ( a q ) + P b ( N
professor190 [17]

Answer: 50.7 grams

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of KI

\text{Number of moles}=molarity\times {\text {Volume in L]}=0.417M\times 0.528L=0.220moles

The balanced chemical equation is:

2KI(aq)+Pb(NO_3)_2(aq)\rightarrow PbI_2(s)+2KNO_3(aq)

KI is the limiting reagent as it limits the formation of product and Pb(NO_3)_2 is in excess.

According to stoichiometry :

2 moles of KI give =  1 mole of PbI_2

Thus 0.220 moles of KI give=\frac{1}{2}\times 0.220=0.110moles  of PbI_2

Mass of PbI_2=moles\times {\text {Molar mass}}=0.110moles\times 461.01g/mol=50.7g

Thus 50.7 g of PbI_2 will be formed.

6 0
3 years ago
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