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hichkok12 [17]
3 years ago
5

Meriwether lewis and william clark (pictured here)a re most associated with which of these? question 3 options: building the pan

ama canal discovering gold in california generals in the american revolution exploration of the louisiana territory.
SAT
1 answer:
Sati [7]3 years ago
6 0

Answer:louisiana Territroy

Explanation:

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According to the reaction represented above, about how many grams of aluminum (atomic mass 27 g) are necessary to produce 0. 50
liq [111]

Answer:

Taking into account the reaction stoichiometry, the correct answer is option B): 9 grams of aluminum are necessary to produce 0.50 mol of hydrogen gas at 25°C and 1.0 atm.

Explanation:

The balanced reaccion is:

6 HCl + 2 Al → 2 AlCl₃ + 3 H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

HCl: 6 moles

Al: 2 moles

AlCl₃: 2 moles

H₂: 3 moles

The atomic mass of aluminum is 27 g/mole. Then, by reaction stoichiometry, the following mass quantity of aluminum participates in the reaction:

Then you can apply the following rule of three: if by reaction stoichiometry 3 moles of H₂ are formed from 54 grams of Al, 0.50 moles of H₂ are formed from how much mass of Al?

mass of Al= 9 grams

In summary, the correct answer is option B): 9 grams of aluminum are necessary to produce 0.50 mol of hydrogen gas at 25°C and 1.0 atm

5 0
2 years ago
Which of the following is a possible reason for migration? a. microevolution b. diminished food supply c. increased ecosystem st
soldier1979 [14.2K]
B. diminished food supply, if there is no sustenance a group is forced to relocate for survival.
6 0
3 years ago
Read 2 more answers
Which characteristic would be best for a career in journalism and broadcasting?
Gala2k [10]
Influence because of the main focus on one topic
4 0
3 years ago
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Industry standards suggest that 9 percent of new vehicles require warranty service within the first year, Jones Nissan in Sumter
aleksklad [387]

Answer:

so probability none of these vehicles requires warranty service  is 0.389416

Explanation:

given data

new vehicles require warranty service π  = 9 % = 0.09

sold nissan n = 10

solution

As we know here binomial probability formula that is

P(x) = _nC_x \ \pi ^x \ (1-\pi )^{n-x}    ......................1

so we use here combination formula that is

_nC_r = \frac{n!}{r!(n-r)!}    .................2

so probability none of these vehicles requires warranty service  is

P(0) =  _{10}C_0 \ \pi ^0 \ (1-\pi )^{10-0}

P(0) = \frac{10!}{0!(10-0)!} (0.09^0) (1-0.09)^{10}

P(0) = 0.389416

so probability none of these vehicles requires warranty service  is  0.389416

8 0
4 years ago
Which statement best describes an oxidation-reduction reaction.
Taya2010 [7]

1. The correct statement that describes a Redox reaction is ( D ) ; A chemical reaction in which electrons are transferred between reactants.

2. The chemical formula that shows the correct subscripts is ( D ) BeF₂

3. The type of reaction that is shown is ; ( C ) decomposition reaction

A Redox reaction ( oxidation-reduction reaction ) involves the exchange/transfer electrons between reactants and the change in the oxidation number of the molecules involved in the reaction changes when an electron is either gained or lost.  

Given that the Be has four ( 4 ) electrons and Fluorine has nine ( 9 ) electrons when they  combine Fluorine will be left with an excess of electrons therefore the correct chemical formula will be BeF₂

The breaking up of an element into its smaller parts in a chemical reaction is known as a decomposition reaction.

8 0
2 years ago
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