2 years ago

Determine the number of moles of a aluminum sample containing 2.89E26 atoms.

Chemistry

1 answer:

Brut [27]2 years ago

8 0

Answer:

Explanation:

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Question 14 A student dissolves 1.5g of styrene C8H8 in 225.mL of a solvent with a density of 1.02/gmL . The student notices tha

Yuki888 [10]

We must to know:

Cm = molarity = niu / Vs, when the niu = no. of moles and Vs = Volume of solution

the no. niu = mass / molecular mass of substance

molecular mass of C8H8 = 12x8+8x1 = 104 g/mol

=> niu = 1,5 / 104 = 0,0144 moles C8H8

=> Cm = 0,0144/0,225 = 0,06 mol/L

Cmm = molality = niu (C8H8) / mass of solvent (kg)

=> p = mass / V => mass (solvent) = p x V

=> 225 x 1,02 = 229,5 g solvent = 0,2295 kg solvent

=> Cmm = 0,0144 / 0,229,5 = 0,063

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2 years ago

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Net ionic equation for Barium chloride

vaieri [72.5K]

Answer: There is one way to write it but i’ll also provide an unbalanced equation and a balanced one.

Explanation:

Unbalanced : Ba (aq) + Cl2 (aq)—-> BaCl (aq)

Balanced : 2Ba (aq) + Cl2 (aq)—> 2BaCl(aq)

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2 years ago

As a chemical reaction occurs, the thermometer in the container records a drop in temperature. What is true of the reaction?

nadya68 [22]

<span>When a chemical reaction occurs and the thermometer in the container records a drop in temperature t</span>he reaction is exothermic because heat was released by the reaction.

<span>B. The reaction is exothermic because heat was released by the reaction. is your answer.

Hoped I helped!</span>

4 0

3 years ago

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Measure of the average kinetic energy of molecules in an in an object

algol13

Yes because molecules is solid

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You place 10 grams of a salt into water and want it to dissolve. All of the following will cause a salt to dissolve faster excep

klio [65]

boiling, salt water will separate the salt from the water through the physical change of water from a liquid to a gas, leaving you with just salt left over.

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2 years ago