12 g of commercial zinc is made to react with excess dilute H2SO4 .The total volume of hydrogen gas liberated was found to be 4.2 litres at 520 mmHg pressure and 279 K. Determine the percentage purity of the zinc.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

answerlinnaeus;