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MaRussiya [10]
3 years ago
7

Suppose the amu had been defined as 110th of the mass of a phosphorus atom. What would be the relative mass of carbon-12?

Chemistry
1 answer:
BabaBlast [244]3 years ago
7 0

Answer:

The relative mass of carbon would be A_{r,C}  = \frac{12}{0.282}=42.62\, amu

Explanation:

The amu is defined as 1/12 of the mass of a ^{12}C atom, thus according to the definition, the relative mass of carbon is exactly 12. If the definition of the AMU changed, we could calculate what the new relative mass is by dividing the relative mass of ^{12}C  by the mass of the new AMU in old AMUs.

The atomic weight of Phosphorus is 30.973, therefore  an amu would be \frac{30.973}{110}=0.282  in old AMUs, if the atomic weight of carbon is 12.00, then in the new amu:

A_{r,C}  = \frac{12}{0.282}=42.62\, amu

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Which weigh more 50mL of water or 50 mL of ice
LenKa [72]

Answer:

Water

Explanation:

5 0
2 years ago
As a "rule of thumb" there are 20 drops of a liquid in a mL. Using this estimate and a density of 1.685, how many moles are in 2
arlik [135]

Answer:

0.020 mol

Explanation:

Let's consider the following relations:

  • 20 drops of a liquid have a volume of 1 mL.
  • The density of the solution is 1.685 g/mL, that is, each milliliter of solution has a mass of 1.685 g of solution.
  • There are 85 g of phosphoric acid per 100 grams of solution (85 % by weight).
  • The molar mass of phosphoric acid is 97.99 g/mol

With these relations, we can calculate the moles of phosphoric acid in 27 drops of solution.

27drop \times \frac{1mL}{20drop} \times \frac{1.685gSolution}{1mL} \times \frac{85gH_3PO_4}{100gSolution} \times \frac{1molH_3PO_4}{97.99gH_3PO_4} = 0.020 mol

4 0
3 years ago
Indicate which of the following are exact numbers. (Select all that apply.) 1.the number of microseconds in a week 2.the number
iVinArrow [24]

Exact numbers need not be measured. They can be counted. Conversion factors and countable units come under exact numbers. Measured quantities are measured using a device.

1) Number of microseconds in a week -Exact as it need not be measured. It can be estimated using the conversion factors between microseconds, seconds, minutes, hours, days and week.

2) Number of inches in a mile - Exact number as it is an established conversion factor.

3) The mass of a paper clip - Measured number as it has to measured using a weighing balance.

4) The number of pages in a book - Exact number as it is not measured. It can be counted.

5) Surface area of the dime-Measured number as it has to be measured.

6) The number of ounces in a pound-Exact number as it is a constant value.

5 0
3 years ago
120.0J of energy are added to a sample of air with unknown mass. The sample increases its temperature from 33.2°C to 45.0°C. Wha
ivanzaharov [21]
The mass of the air  sample  is calculated using  the below

Q(heat)=M(mass) x C(specific heat capacity) x delta T(change  in temperature)

Q= 120.j
M=?
C= 1.0j/g/c
delta T =45.0-33.2=11.8 c
by making M the subject of the formula

M=Q/C delta T

  = 120 j/ 1.0 j/g/c x11.8 c=10.17 grams

5 0
3 years ago
Explain why the quantum number set (3,2,-3,+1/2) is not possible for an electron in a ground state atom
fredd [130]
L = an integer from 0 to n-1 
<span>mL = an integer from -L to +L </span>
<span>ms = + or - 1/2 </span>

<span>the format is (n, L, mL, ms) </span>

<span>so your </span>
<span>n = 3... this is OK </span>
<span>L = 2.. also OK.. if n=3, L can = 0, 1, or 2 </span>
<span>mL = -3 is NOT ok... if L=2.. mL can only be -2, -1, 0, +1, or +2 </span>
<span>ms = +1/2 and that is ok

Hope this helps!</span>
3 0
3 years ago
Read 2 more answers
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