Question

1. Hydrochloric acid can dissolve solid magnesium according to the reaection below. What minimum magnesium in grams can be dissolved by 8.52 g of HCI? (3 pts) Mg(s) + 2 HCl(aq) + MgCl2(aq) + H2(g) 2. Consider the reaction between NiS2 and O2 below. If 24.3 g of NiS2 reacts with 22.6 g of O2, what is the limiting reactant and theoretical yield of NiO? (5 pts) 2 NiSz(s) + 5 O2(g) 2 NiO(s) + 4 SO2(g) 3. The equation for the combustion of CH4 (the main component of natural gas) is shown below. How much heat is produced by the reaction of 0.553 mol of O2? (2 pts) CH4(g) + 2 O2(g) + CO2(g) + 2 H2O(g) AH,xn--802.3 kJ

Answer 1

1)

Molar mass of HCl,
MM = 1*MM(H) + 1*MM(Cl)
= 1*1.008 + 1*35.45
= 36.458 g/mol

mass of HCl = 8.52 g
mol of HCl = (mass)/(molar mass)
= 8.52/36.46
= 0.2337 mol

According to balanced equation
mol of Mg formed = (1/2)* moles of HCl
= (1/2)*0.2337
= 0.1168 mol


Molar mass of Mg = 24.31 g/mol


mass of Mg = number of mol * molar mass
= 0.1168*24.31
= 2.841 g
Answer: 2.84 g

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