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2 years ago

Which of the following shows a correct base pairing in DNA

Chemistry

1 answer:

statuscvo [17]2 years ago

6 0

DNA bop it does not say it in my test

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1. How many grams would 8.1 x 1021 molecules of sucrose (C12H22011) weigh?

Nimfa-mama [501]

Answer:

Mass = 4.6 g

Explanation:

Given data:

Number of molecules of sucrose = 8.1 ×10²¹ molecules

Mass of sucrose = ?

Solution:

First of all we will calculate the number of moles by using Avogadro number.

1 mole × 8.1 ×10²¹ molecules / 6.022×10²³ molecules

1.35 × 10⁻² mol

Mass of sucrose:

Mass = number of moles × molar mass

Molar mass = 342.3 g/mol

Mass = 1.35 × 10⁻² mol ×342.3 g/mol

Mass = 462.1 × 10⁻² g

Mass = 4.6 g

7 0

3 years ago

The half-life for the radioactive decay of ce−141 is 32.5 days. if a sample has an activity of 3.8 μci after 162.5 d have elapse

Umnica [9.8K]

Answer : 121.5 μCi

Explanation : We have Ce-141 half life given as 32.5 days so if the activity is 3.8 μci after 162.5 days of time elapsed we have to find the initial activity.

We can use this formula;

 $\frac{N}{ N_{0} } = e^{-( \frac{0.693 X T_{2} }{T_{1}})$

3.8 / $N_{0}$ = $e^$ ((0.693 X 162.5 ) / 32.5) = 121.5

On solving we get, The initial activity as 121.5 μci

5 0

2 years ago

Read 2 more answers

Help pls i really need help

MaRussiya [10]

Answer: I think it's 1

Explanation: Potential energy means stored energy . In Position 1 it's not moving the energy is being stored. Hope that helps.

6 0

2 years ago

Read 2 more answers

If the equation, C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2 (l), were performed in a laboratory at room temperature, both of the gas

JulsSmile [24]

Yes it could be calculated everything that has numbers like those you calculate them and see what u get

3 0

3 years ago

Describe in your words what it means for a chemical reaction system to be at equilibrium.

Black_prince [1.1K]

To be at equilibrium means the rate of the forward reaction must equal the rate of the reverse reaction. This does not mean that there should be an equal amount of both products and reactants when at equilibrium. It simply means the RATES of the forward and the reverse are equal to one another.

6 0

3 years ago