Question

4. Zn(s) + H2SO4(aq) → ZnSO4(0) + H2 50.0g of H2SO4 produce how many grams of H? Type of Rxn 5. Nas) + H2O + NaOH(aq) + H2O) 5.00 moles of H2O produce how many moles of H2? Type of Rxn 6. Cus) + Se → CuS Type of Rxn How many grams of S are needed to produce 10.0g of Cus?

Answer 1

4)

This is single displacement reaction

Answer: single displacement reaction

Balanced equation is:

Zn(s) + H2SO4(aq) -> ZnSO4(aq) + H2(g)

Molar mass of H2SO4,

MM = 2*MM(H) + 1*MM(S) + 4*MM(O)

= 2*1.008 + 1*32.07 + 4*16.0

= 98.086 g/mol

mass of H2SO4 = 50 g

mol of H2SO4 = (mass)/(molar mass)

= 50/98.09

= 0.5098 mol

  

According to balanced equation

mol of H2 formed = moles of H2SO4

= 0.5098 mol

Molar mass of H2 = 2.016 g/mol

mass of H2 = number of mol * molar mass

= 0.5098*2.016

= 1.028 g

Answer: 1.03 g

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