Question

What mass of hydrochloric acid that reacted with zinc will produced 0.15dm3 of hydrogen at st.p? Equation for this reaction:

Zn + 2HCl ------> ZnCl2 + H2​

Answer 1

`{ \tt{22.4 \: dm {}^(3) \: contains \: 1 \: mole \: of \: hydrogen }} \\ { \tt{0.15 \: {dm}^(3) \: will \: contain \: ( (0.15)/(22.4) * 1) \: moles }} \\ = 0.0067 \: moles \\ { \bf{mole \: ratio = 1 :1 }} \\ { \tt{1 \: mole \: weighs \: 65.38 \: g}} \\ { \tt{0.0067 \: moles \: weighs \: (0.0067 * 65.38) \: g}} \\ = 0.44 \: g`