3 years ago

John F. Kennedy was the youngest man ever to be elected President of the United States.

Physics

1 answer:

Furkat [3]3 years ago

5 0

False. Theodore Roosevelt was the youngest.

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light traveling through air encounters a second medium which slows the light to 100,000 miles/second. What is the index of the s

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Explanation:

300000

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If the pressing force on the slidding surfaces is greater then friction will be

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What mass of ice (in g) can be melted if 27.2 kJ of thermal energy are added at the freezing point? Use molar mass = 18.02 g/mol

san4es73 [151]

Answer : The mass of ice melted can be, 3.98 grams.

Explanation :

First we have to calculate the moles of ice.

$Q=\frac{\Delta H}{n}$

where,

Q = energy absorbed = 27.2 kJ

$\Delta H$ = enthalpy of fusion of ice = 6.01 kJ/mol

n = moles = ?

Now put all the given values in the above expression, we get:

$27.2kJ=\frac{6.01kJ/mol}{n}$

$n=0.221mol$

Now we have to calculate the mass of ice.

$\text{Mass of ice}=\text{Moles of ice}\times \text{Molar mass of ice}$

Molar mass of ice = 18.02 g/mol

$\text{Mass of ice}=0.221mol\times 18.02g/mol=3.98g$

Thus, the mass of ice melted can be, 3.98 grams.

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E. weight = mass x gravitational field strength

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