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telo118 [61]
4 years ago
12

What is the speed of an object that moves 100 meters in 5 seconds?

Chemistry
1 answer:
Olin [163]4 years ago
4 0

Answer:

speed= distance/time

= 100/5=20mph

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shepuryov [24]

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Give me 3 facts and 3 Superstitious about the moon​
andreyandreev [35.5K]

Answer:

On this 40th anniversary of the moon landing, let's consider where these beliefs and urban legends come from.

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3 years ago
Determine the heat of reaction (ΔHrxn) for the combustion of ethanol (C2H5OH) by using heat of formation data: C2H5OH (l) + 3 O2
egoroff_w [7]

Answer:

\Delta H_{rxn}=-1234.782kJ

Explanation:

\Delta H_{rxn}=\sum [n_{i}\times \Delta H_{f}^{0}(product)_{i}]-\sum [n_{j}\times \Delta H_{f}^{0}(reactant_{j})]

Where n_{i} and n_{j} are number of moles of product and reactant respectively (equal to their stoichiometric coefficient).

\Delta H_{f}^{0} is standard heat of formation.

So, \Delta H_{rxn}=[2mol\times \Delta H_{f}^{0}(CO_{2})_{g}]+[3mol\times \Delta H_{f}^{0}(H_{2}O)_{g}]-[1mol\times \Delta H_{f}^{0}(C_{2}H_{5}OH)_{l}]-[3mol\times \Delta H_{f}^{0}(O_{2})_{g}]

or, \Delta H_{rxn}=[2mol\times -393.509kJ/mol]+[3mol\times -241.818kJ/mol]-[1mol\times -277.69kJ/mol]-[3mol\times 0kJ/mol]

or, \Delta H_{rxn}=-1234.782kJ

4 0
4 years ago
Becky is preparing tea. When the water for the tea boils, she pours it in a cup of cold milk. Assuming that the system is closed
Artemon [7]

Answer:B

Explanation:

4 0
4 years ago
Read 2 more answers
explain how two substances can be at different temperatures but still have the same amount of thermal energy. give an example
Alex777 [14]
Two objects having the same internal energy may have different temperatures if their masses and specific heats are different and it's possible that an object with more eternal energy may be at a lower temperature than the one with less internal energy.
3 0
3 years ago
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