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4 years ago

Nuclides with too many neutrons to be in the band of stability are most likely to decay by what mode

1 answer:

4 0

Nuclides with too many neutrons to be in the band of stability are most likely to decay by beta particle emission. A beta particle is a high speed electron thus a particle which has high energy. This emission involves a beta ray and a neutrino from the process. With this type of emission, unstable atoms would have a more stable ratio of neutrons to protons.

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Seven vans each hold 6 passengers. Each passenger is carrying 20 candies divided equally among 5 small boxes. How many candies a

HACTEHA [7]

I believe the correct answer from the choices listed above is the first option. There are about 840 candies present on all vans present. We calculate it by multiplying the number of total passengers by the number of candies each passenger is carrying. Hope this answers the question.

8 0

3 years ago

** will mark you brainliest if answered correctly **

lord [1]

Answer:

D. 23.9 liters

Explanation:

Molarity is defined as the no. of moles of solute dissolved in 1.0 L of the solution.

M = (no. of moles)solute / (V of the solution (L))

M = (mass/molar mass)NaCl / (V of the solution (L))

M = 0.03 M, mass of NaCl = 42.0 g, molar mass = 58.44 g/mol.

∴ V of the solution = (mass/molar mass)NaCl / M = [(42.0 g/58.44 g/mol)] / (0.03 M) = 23.96 L.

<em>So, the right choice is: D. 23.9 liters</em>

7 0

3 years ago

How many moles of Cl2 are needed in order to produce 100.0 grams of FeCl3 given the following

dimulka [17.4K]

Answer:

0.92moles

Explanation:

Given reaction:

2Fe + 3Cl₂ → 2FeCl₃

Mass of FeCl₃ = 100g

Unknown:

Number of moles of Cl₂ needed = ?

Solution:

To solve this problem, we work from the known specie to the unknown.

From the mass of the FeCl₃ given, we can solve for the number of moles of the unknown.

Number of moles of FeCl₃;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of FeCl₃ = 56 + 3(35.5) = 162.5g/mol

Number of moles = $\frac{100}{162.5}$ = 0.62mole

From the reaction expression;

2 mole of FeCl₃ is produced from 3 moles of Cl₂

0.62 mole of FeCl₃ will be produced from $\frac{0.62 x 3}{2}$ = 0.92mole

The number of moles of Cl₂ = 0.92moles

5 0

3 years ago

What is known about a reaction with a positive enthalpy?

Veseljchak [2.6K]

Answer:

"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."

Explanation:

7 0

3 years ago

What volume in liters, l, of solution should sven prepare if he wants to make a 5.00 m solution using 210.0 grams, g, of sodium

weeeeeb [17]

To make a 5.00 M solution using 210.0 grams, g, of sodium chloride, NaCl, we will use the formula of volume of solution in liters is equal to mole of solute per molarity of solution, which is 0.718 L.

Molarity (M) refers to the amount of a substance in a specific volume of solution. It is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.

Molarity is given by the quotient,

Molarity = moles of solute/volume of solution in liters.

Now in order to get the molarity of the solution, we have to divide the moles of solute over the liters of solution. Since we are given the mass of the solute, we must first convert the mass of NaCl into moles with the help of the molar mass of NaCl as a conversion factor.

210 NaCl x ( 1 mol NaCl/ 58.44g NaCl) = 3.59 mol NaCl.

We already have the molarity of the solution that is 5.00 M. So the solution to find out the volume will be,

Volume of solution in liters = mole of solute/ molarity of solution,

That is 3.59 mol NaCl / 5M = 0.718 L

To learn more about Molarity, head here

brainly.com/question/8732513

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5 0

2 years ago