1. Using the below chemical equation, how many moles of magnesium are needed to

Question

1. Using the below chemical equation, how many moles of magnesium are needed to react with 0.49 moles of oxygen gas? The molar mass of oxygen gas is 31. 998 grams per mole and the molar mass of magnesium is 24.305 grams per mole. Make sure to include the correct unit symbol with the answer choice.

2Mg + O2 2MgO

2. Propyl acetate, C5H10O2, gives the odor and taste to pears. How many moles of hydrogen present in 1.74 moles of propyl acetate? Propyl acetate molar mass is 102.13 grams per mole. Make sure to include the correct unit symbol with the answer choice.

3. Using the below chemical equation, what mass, in grams of magnesium oxide is produced when 1.346 moles of oxygen gas reacts completely? The molar mass of oxygen gas is 31.998 grams per mole and the molar mass of magnesium is 24.305 grams per mole. Make sure to include the correct unit symbol with the answer choice.

4. Propyl acetate, C5H10O2, gives the odor and taste to pears. How many moles of carbon are present in 0.63 moles of propyl acetate? Propyl acetate molar mass is 102.13 grams per mole. Make sure to include the correct symbol with the answer choice.

5.

How much heat, in kilojoules, is released when nitrogen and hydrogen react to form 70.5 grams of ammonia?

N2 + 3H2 2NH3 H = -90.6 kilojoules

Explanation / Answer

1)

From reaction,

when 2 mol of Mg reacts, 1 mol of O2 is reacting

So,

moles of Mg = 2*moles of O2

= 2*0.49 moles

= 0.98 moles

Answer: 0.98 moles

2)

1 mol of C5H10O2 has 10 moles of H

So,

moles of H = 10*mol of C5H10O2

= 10*1.74 moles

= 17.4 moles

Answer: 17.4 moles

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