⚛️ Chemistry

# What Mass of zinc reacts with sulfric acid is to make 2.08x10^-3Grams of H2 gas?  Verified
Abdul Hannan KhanI would like to help children develop thier critical thinking skills.9 students helped

Carrying on from previous answer (apologies accidentally submitted the answer) Rearrange the equation to: Mass = RMM * No of moles Mass = 65.38 (RMM of Zinc) * 1.04*10^-3 (No of moles of Zinc) Mass = 0.0068g is the mass of Zinc.  Verified
Abdul Hannan KhanI would like to help children develop thier critical thinking skills.9 students helped

I'm assuming this is a 1:1 reaction between Zinc and Sulfuric acid. Based on this we know that the no of moles on the on both sides are the same and the following reaction occurs: Zn + H2SO4 --> ZnSO4 + H2 We have the following: Relative Molar mass (RMM) of Zinc: 65.38 RMM of H2: 2 Mass of H2: 2.08*10^-3 g First we need to work out the no of moles of Hydrogen present: No. of moles = mass / RMM No. of moles = 2.08*10^-3 g / 2 (g/mol) No. of moles = 1.04*10^-3 mol Since no. of moles are the same on both sides we can say the zinc has 1.04*10^-3 moles as well No. of moles = mass / RMM Mass = ? No of moles = 1.04*10^-3 mol RMM of Zinc = 65.38 g/mol Rearrange to: Mass = RMM* 