A sample of an unknown substance has a mass of 89.5g. If 345.2 J of heat are required to heat the substance from 285K to 305k, what is the specific heat of the substance?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Word equation for k(s) +h2o(l) yield koh (aq) + h2