How many moles of SiC are produced from 9.3 moles C?

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

Calculate the number of molecules present in 0.750 mol of mgo.

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na, so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g