What is the percent composition, by mass, of a solution prepared by dissolved 10 grams of hydrochloric acid in 40 grams of water? *
(i don’t need work just an answer)

Which type of fossil does this image depict?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.