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podryga [215]
3 years ago
7

Isotopes of an element will {always, sometimes, or never) have the same number of protons.

Chemistry
1 answer:
dusya [7]3 years ago
4 0

Answer:

Isotopes of an element will ALWAYS have the same number of protons.

Explanation:

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Calculate the mass of water produced when 42 g of propane, c3h8, is burned with 115 g of oxygen
gavmur [86]
The balanced combustion reaction of propane, C₃H₈, is

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

Molar mass of propane: 44 g/mol
Moles of propane = 42 g * (1 mol/44g) = 0.9545 mol propane

Molar mass of oxygen: 32 g/mol
Moles of oxygen = 115 g * (1 mol/32 g) = 3.594 mol oxygen

Moles of oxygen needed to completely react propane:
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Since the available oxygen is only 3.594 moles and propane needs 4.7725 moles, that means oxygen is our limiting reactant. We base the amount of water produced here.

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Mass of water produced = 258.768 grams
6 0
3 years ago
Why doesn’t vegetable oil stay dissolved in vinegar to make a salad dressing?
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