What is the mass of a sample of glass (specific heat = 0.50 J/g C) if it requires 490 J of heat to raise the temperature from -18.0 C to 0.0 C?

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

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?