A sample of copper was heated to a temperature of 89.0°C. The piece of copper was then dropped into 55.0g of water, initially at 23.0°C. The temperature of the water rose to 27.2°C. Assuming that all the heat lost by the copper is absorbed by the water, calculate the mass of the copper. (The specific heat of copper is 0.385 J/g°C). Please show work

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.