The chemical equation below shows the reaction between tin (sn) and hydrogen fluoride (hf). sn + 2hf snf2 + h2 the molar mass of hf is 20.01 g/mol. how many moles of sn are required to react with 40 g of hf? 1 2 3 4

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign