Given the balanced equation CH_4+2O_2 rightarrow CO_2 + 2H_2O, which of the foll

Question

Given the balanced equation CH_4+2O_2 rightarrow CO_2 + 2H_2O, which of the following is NOT a correct conversion factor? 1mole CH_4 = 2 mole H_2O 1 mole O_2 = 32.00 g 2 mole H_2O = 18.02 g 2 mole O_2 = 1 mole CO_2 none of the above How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl_2 rightarrow 2NaCl 46.0 23.0 5.75 11.5 not enough information How many moles of water are needed to react with 2.2 moles of Li_2O? Given: Li_2O + H_2O rightarrow 2 LiOH 4.4 1.5 2.2 1.1 none of the above

Explanation / Answer

24)

Answer: 2 mol of H2O = 18.02 g

Reason:

molar mass of H2O = 18.02 g/mol

so,

2 mol of H2O = 2*18.02 g/mol = 36.04 g/mol

25)

mass of NaCl = 29.3 g

molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

so,

mol of NaCl = mass/molar mass

= 29.3/58.5

= 0.050 mol

From reaction,

mol of Na = mol of NaCl

so,

mol of Na = 0.050 mol

mass of Na = mol of Na * molar mass of Na

= 0.050 mol * 23 g/mol

= 11.5 g

Answer: 11.5 g

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