Tính thể tích khí H2 điều kiện tiêu chuẩn thu được khi nào 11,2gam Fe tác dụng với a) dung dịch H2SO4 loãng dư
b) 150ml dung dịch H2SO4 1M

Which statement about the stamps is correct?

Why do cells appear different in distilled water than they do in 10% salt water?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]