Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa

A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the ligh

Rufina [12.5K]

Answer:

The mass of heavier isotope is 345.6 amu.

Explanation:

Given data:

atomic wight of compound = 342.38 amu

lighter isotope mass = 340.91 amu

abundance of lighter isotope = 68.322%

mass of heavier isotope = ?

Solution:

average atomic mass = ( % age abundance of lighter isotope × its atomic mass) + (% age abundance of heavier isotope × its atomic mass) / 100

percentage of heavier isotope = 100- 68.322 = 31.678

Now we will put the values in formula.

342.38 = (68.322× 340.91) + (31.678 × X) / 100

342.38 = 23291.65302 + (31.678 × X) / 100

342.38 × 100 = 23291.65302 + (31.678 × X)

34238 -23291.65302 = (31.678 × X)

10946.35 / 31.678 = X

345.6 = X

The mass of heavier isotope is 345.6 amu.

5 0

3 years ago

I need helps plss!!!!

Leni [432]

Answer:

Copper = 2 Boron = 12 (copper and boron combined = 14)

Explanation:

the number after the element is the amount of atoms there is

8 0

2 years ago

Round off each number to the indicated number significant figures (sf):

qaws [65]

Answer :

(a) The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number in 3 significant figures will be, $2.24\times 10^1$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

(a) The given number 00003554 converted into 2 significant figures.

In 00003554, there are 4 significant figures. Now we have to convert it into 2 significant figures.

The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number 35.8348 converted into 4 significant figures.

In 35.8348, there are 6 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number 22.4555 converted into 3 significant figures.

In 22.4555, there are 6 significant figures. Now we have to convert it into 3 significant figures.

The given number in 3 significant figures will be, $2.24\times 10^1$

7 0

3 years ago

Looking at page 14 of the earth science tables, how does the temperature change as a balloon rises through the Troposphere Strat

givi [52]

Answer:

Decreases

Explanation:

The temperature decreases when latitude increases.

5 0

2 years ago

Essential amino acids cannot be made

sattari [20]

Answer:

True

Explanation:

There are 9 essential amino acids which cannot be made by the body and have to be obtained from food.

They are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine

4 0

2 years ago