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mafiozo [28]
3 years ago
10

A new element X is found and in the sample 70% has a mass number of 43, 25% is X-44, & 5% is X-47. What is the (average) ato

mic mass of this new element?
Chemistry
1 answer:
Semenov [28]3 years ago
6 0

The average atomic mass of this new element X is 43.45

HOW TO CALCULATE AVERAGE ATOMIC MASS:

  • The average atomic mass of an element can be calculated by the following steps:

  1. multiplying the atomic mass of each isotope with its relative abundance
  2. Then sum the results for each isotope

According to this question; a new element X is found and in the sample:

  1. 70% is X-43
  2. 25% is X-44
  3. 5% is X-47

The average atomic mass of element X is calculated thus:

X-43: 70/100 × 43 = 30.1

X-44: 25/100 × 44 = 11

X-47: 5/100 × 47 = 2.35

Next, we sum the results as follows:

= 30.1 + 11 + 2.35

= 43.45

  • Therefore, the average atomic mass of this new element X is 43.45.

Learn more: brainly.com/question/13753702?referrer=searchResults

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Neko [114]

Answer:

Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.

8 0
3 years ago
If water were a linear (not bent) molecule like co2, electrostatic interactions between water molecules would be much weaker. wh
Ksenya-84 [330]

Answer;

The partial negative charge on oxygen would stick out less and be less able to participate in hydrogen bonding.

Explanation;

Water is a polar molecule because the electrons are not shared equally, they're closer to the oxygen atom than the hydrogen.

-Normally, the water molecule is a bent shape because of the pair of lone electrons - they repulse each other and exert a compression to the hydrogen atoms at a slight 104º angle. It is a bent molecular geometry that results from tetrahedral electron pair geometry.

-The 2 lone electron pairs exerts a little extra repulsion on the two bonding hydrogen atoms to create a slight compression to a 104 degrees bond angle. Therefore, the water molecule is bent molecular geometry because the lone electron pairs.

Thus, If water were a linear molecule like co2, electrostatic interactions between water molecules would be much weaker, then the partial negative charge on oxygen would stick out less and be less able to participate in hydrogen bonding.

3 0
3 years ago
What is the volume of an object with a mass of 220g and a desnisty of 55cm3?
dmitriy555 [2]
Volume=Mass over density. V= 220/55. V=4cm^3
7 0
3 years ago
A boy weighing 25 kg sits in a 1000 kg car at a speed of 15 m/s. What is the total momentum of the car and the boy?
dexar [7]

Answer:

D) 15375kgm/s

Explanation:

weight of the boy 25kg +weight of the car 1000kg= 1025kg so momentum =mass × velocity. so it's SI unit is = kg×m/s = kg m/s.

7 0
3 years ago
A hydrogen atom has a diameter of about 10 nm. Express this diameter in micrometers, meters, and millimeters.
MariettaO [177]

1) 1 nm = 0.001 µm; one nanometer is equal to 0.001 (10⁻³) micrometer.

d(H) = 10 nm; diameter of hydrogen atom.

d(H) = 10 nm · 0.001 µm/nm.

d(H) = 0.01 µm = 10⁻² µm.

2) 1 nm = 10⁻⁹ m ; one meter is equal to 0.0000000001 (10⁻⁹) meter.

d(H) = 10 nm.

d(H) = 10 nm · 10⁻⁹ m/nm.

d(H) = 0.00000001 m = 10⁻⁸ m.

3) 1 nm = 10⁻⁶ mm ; one nanometer is equal to 0.000001 (10⁻⁶) millimeter.

d(H) = 10 nm · 10⁻⁶ mm/nm.

d(H) = 0.00001 mm = 10⁻⁵ mm.

4 0
3 years ago
Read 2 more answers
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