Cho m (g) hh gồm Mg Fe vào 150g dd HCl 2,34 % sau phản ứng thu đc V lít H2 (đktc)
tính V

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?