Calculate the molecular weights for nh3 and sf6.

Hi there,

NH3 has the weight of 17.03 grams, and SF6 has the weight of 146.06 grams 

so in total, there is 163.09 grams

Hope this helps :P

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The use of piers and beams to build a strong foundation for a house.

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.