The pressure of a weather balloon is measured at dawn. The volume of the balloon is 850 litres when the temperature is 10 degrees Celsius and has a pressure of 240 kPa. The balloon is filled to the point at which it can no longer expand. The temperature will reach 37 degrees Celsius by noon. /
A) What will be the new pressure inside of the balloon at noon (assuming its volume does not change)? Explain your answer.
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B) How many moles of helium does the weather balloon contain?
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C) The scientist decides to change the initial pressure, so the balloon is not in danger of bursting on such a hot day. Calculate the highest pressure that the balloon can begin with in the morning to avoid exceeding 252 kPa at 37 degrees Celsius. Assume a constant volume.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.