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Fudgin [204]
3 years ago
5

A student investigates a pure metal, X. The student takes a 100.0 g piece of metal X, heats it

Chemistry
1 answer:
Mila [183]3 years ago
5 0

Answer:

apple sauce penguin bro im lost! u got a picture?

Explanation:

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A solution is prepared by dissolving 15.0 g of nh3 in 250.0 g of water. the density of the resulting solution is 0.974 g/ml. the
sergeinik [125]
The formula for molality---> m = moles solute/ Kg of solvent

the solute here is NH₃ because it's the one with less amount. which makes water the solvent.

1) let's convert the grams of NH₃ to moles using the molar mass

molar mass of NH₃= 14.0 + (3 x 1.01)= 17.03 g/ mol

15.0 g (1 mol/ 17.03 g)= 0.881 mol NH₃

2) let's convert the grams of water into kilograms (just divide by 1000)

250.0 g= 0.2500 kg

3) let's plug in the values into the molality formula

molality= mol/ Kg---> 0.881 mol/ 0.2500 kg= 3.52 m
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3 years ago
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den301095 [7]
Record observations, pose a question, create a test for an individual variable, test, come to a conclusion
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Dominik [7]
There should be mass balance and the charge balance between the reactants and the products

Mass balance : total no of individual atoms of each type should be balanced before and after the reaction

Charge balance : Overall charge of the reactants should be balanced with the overall charge of the products

You can balance,

1)by just looking at it

2)by Algebraic method given above or

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You need to know how to get the oxidation numbers in order to use the oxidation method

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You forgot to post 'the following' .
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The correct answer is b
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