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masya89 [10]
3 years ago
9

Why don’t we include the mass of an atoms electrons in the atomic mass?

Chemistry
1 answer:
Daniel [21]3 years ago
8 0

Because Electrons have a negative charge

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If 585.24 Joules of heat are added to 53.2 grams of water at 24.15oC, what will the new temp. be?
spayn [35]
E = mct
Energy = (mass) x (specific heat capacity of water) x (change in temp)

585.24 = 53.2 x 4.2 x (X-24.15)


585.24 divided by 53.2 divided by 4.2 = X - 24.15

2.62 = X - 24.15

X= 26.77degrees C

(Specific heat capacity for water is 4.2 but is different for other liquids)
3 0
3 years ago
A student weighs out a 6.64 g sample of , transfers it to a 500. mL volumetric flask, adds enough water to dissolve it and then
Vsevolod [243]

Answer:

the molarity of cobalt(II) fluoride in the resulting solution is = 0.137  M

Explanation:

Given that :

a student dissolves 6.64 g of CoF₂  into 500 mL of water

volume of the solution(water) = 500 mL = 0.50 L

The standard  molar mass of CoF₂ is 96.93 g/mol

number of moles of CoF₂ = mass of CoF₂/molar mass of CoF₂

number of moles of CoF₂ = 6.64 g/96.93 g/mol

number of moles of CoF₂ = 0.0685 mol

The molarity of any given substance is known to be as the number of moles of solute dissolved in one litre of solution.

Thus ;

Molarity of  cobalt(II) fluoride CoF₂ in the resulting solution is = number of moles / Volume in (L)

Molarity of  cobalt(II) fluoride CoF₂  = 0.0685 mol/ 0.50 L

= 0.137  M

Thus ; the molarity of cobalt(II) fluoride in the resulting solution is = 0.137  M

7 0
3 years ago
How does a best fit line take into account errors in reading and recording data from the experiment?
marin [14]

Answer:

Answer below!

Explanation: Mean -- add all of the values and divide by the total number of data points.

Error -- subtract the theoretical value (usually the number the professor has as the target value) from your experimental data point.

Percent error -- take the absolute value of the error divided by the theoretical value, then multiply by 100

7 0
3 years ago
Read 2 more answers
Which material is a pure substance?
o-na [289]
The answer is B. The material that can be considered as a pure substance is the compound. A pure substance is defined as a material that is only composed of one substance. The other choices given are mixtures where there are two or more different substances in a material.
8 0
3 years ago
Read 2 more answers
given that the molar mass of H2O is 18.02g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this
UNO [17]

C₃H₈ + 5O₂ = 3 CO₂ + 4 H₂O


44.1 g ----------- 4* 18.02 g

? g --------------- 75 g


mass of C₃H₈ = 75 * 44.1 / 4 * 18.02


mass of C₃H₈ = 3307.5 / 72.08


= 45.886 g of propane


number of moles:

45.886 / 44.1 = 1.0404 moles

1 mole --------- 22.4 L ( at STP )
1.0404 moles ----- ?

v = 1.0404 * 22.4 / 1

v = 23.304 L

hope this helps!
8 0
3 years ago
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