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tatyana61 [14]
3 years ago
6

if you measure the mass of a model car to be 230 grams. the actual mass is 218 grams. what is your percent error.

Chemistry
1 answer:
Roman55 [17]3 years ago
6 0
27.6% is the correct answer 
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HELP PLS!
olya-2409 [2.1K]
I have the same question right now and i think that it is D
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Identify the solution that contains both the solute and solvent in the solid phase. A) air B) NaCl C) bronze D) salt water
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Explanation:

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How many kJ of heat are released by the reaction of 25.0 g of Na2O2(s) in the following reaction? (M = 78.0 g/mol for Na2O2)
solong [7]

-20.16 KJ of heat are released by the reaction of 25.0 g of Na2O2.

Explanation:

Given:

mass of Na2O2 = 25 grams

atomic mass of Na2O2 = 78 gram/mole

number of mole = \frac{mass}{atomic mass of 1 mole}

                          = \frac{25}{78}

                          =0. 32 moles

The balanced equation for the reaction:

2 Na2O2(s) + 2 H2O(l) → 4 NaOH(aq) + O2(g) ∆Hο = −126 kJ

It can be seen that 126 KJ of energy is released when 2 moles of Na2O2 undergoes reaction.

similarly 0.3 moles of Na2O2 on reaction would give:

\frac{126}{2} = \frac{x}{0.32}

x = \frac{126 x 0.32}{2}

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Thus, - 20.16 KJ of energy will be released.

6 0
3 years ago
According to the kinetic molecular theory of gases, molecules of an ideal gas
Elan Coil [88]
Molecules of an ideal gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size.
7 0
3 years ago
Wh
sergey [27]

The correct option would be 3.

Only thermal energy changes


Hope this helps you

Brainliest would be appreciated

-AaronWiseIsBae

5 0
2 years ago
Read 2 more answers
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