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torisob [31]
3 years ago
5

There are 14 women and 12 men in an engineering class. The professor wants to send some of his students to a national conference

. If the professor chooses four students from the class at random to attend, what is the probability that exactly three of the students who are chosen are women? Round your answer to the nearest tenth of a percent. 7.3% 6.7% 5.7% 14.0%
Chemistry
1 answer:
Viktor [21]3 years ago
4 0

7.3% would be the correct answer

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What is the percent yield if the actual yield is 25 g and 100 g should have formed?
atroni [7]

It is 25%. 25g ÷ 100g × 100% = 25%

8 0
3 years ago
The identity of an element is defined by its number of _______________. For example, every atom of Carbon has ___ protons and on
DiKsa [7]
In this order.
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7 0
3 years ago
What is the total number of atoms of magnesium and phosphorus in 3Mg3(PO4)2?
JulsSmile [24]
Since the given formula is . According to cross method formula, magnesium has +2 charge so, is multiplied by 2.
Thus, 1 molecule of magnesium phosphate will contain 2 atoms of phosphorus.
Therefore, three molecules of magnesium phosphate contains following number of atoms.
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4 0
3 years ago
Fe(NO3)2 not sure how to get the oxidation numbers of all elements
Shtirlitz [24]
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4 0
3 years ago
2Pb(s) + O2(aq) + 4H+(aq) → 2H2O(l) + 2Pb2+(aq)
defon

Answer:

The answer to your question is 0.269 g of Pb

Explanation:

Data

Lead solution = 0.000013 M

Volume = 100 L

mass = 0.269 g

atomic mass Pb = 207.2 g

Chemical reaction

                        2Pb(s) + O₂(aq) + 4H⁺(aq) → 2H₂O(l) + 2Pb₂⁺(aq)

Process

1.- Calculate the mass of Pb in solution

Formula

Molarity = \frac{number of moles}{volume}

Solve for number of moles

Number of moles = Volume x Molarity

Substitution

Number of moles = 100 x 0.000013

Number of moles = 0.0013

2.- Calculate the mass of Pb formed.

                       207.2 g of Pb ----------------- 1 mol

                             x g             ----------------- 0.0013 moles

                        x = (0.0013 x 207.2) / 1

                        x = 0.269 g of Pb                                                                

8 0
3 years ago
Read 2 more answers
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