3 years ago

When a pole-vaulter who is running forward plants a pole in the ground to jump, he is converting kinetic energy into what?

Chemistry

2 answers:

denis-greek [22]3 years ago

7 0

The person above me is correct

anastassius [24]3 years ago

3 0

D.elastic potential energy

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A mixture of BaCl2 and NaCl is analyzed by precipitating all the barium as BaSO4. After addition of an excess of Na2SO4 to a 3.6

Juli2301 [7.4K]

Answer:

$\% m=40.46\%$

Explanation:

Hello there!

in this case, according to the given information, it turns out firstly necessary for us to write up the chemical equation as shown below:

$BaCl_2+Na_2SO_4\rightarrow BaSO_4+2NaCl$

Thus, we calculate the mass of BaCl2 stoichiometrically related to the produced 1.658 g of precipitate in order to discard it from the sample:

$m_{BaCl_2}=1.658gBaSO_4*\frac{1molBaSO_4}{233.38 gBaSO_4} *\frac{1molBaCl_2}{1molBaSO_4}*\frac{208.23 gBaCl_2}{1molBaCl_2}\\\\m_{BaCl_2}=1.479gBaCl_2$

Thus, the mass percentage is calculated as shown below:

$\% m=\frac{1.479g}{3.656g}*100 \% \\\\\% m=40.46\%$

Regards!

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SashulF [63]

Answer:

b is the answer 1000ml

please mark me brainlist

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What is the mass of 6.25 moles of Ca(OH)2?

Shtirlitz [24]

Mass/moles x mr
so you need to work out the rfm of Ca(OH)2= 40(16+1)2= 40+34= 74
and then use the formula= moles x mr
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