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3 years ago

If an atom’s mass number is 210 and its atomic number is 85, how many neutrons does it have?

Chemistry

1 answer:

Nadya [2.5K]3 years ago

3 0

Mass number is the total number of Protons and Neutrons. Simply subtract 85 from 210. 210-85=125 neutrons

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Choose the best description of what is wrong with the following electron configuration for an electrically neutral atom of Chlor

Ksivusya [100]

I believe it is "There are low energy orbitals which have not been filled to hold the maximum number of electrons" because it went from 2p5 to 3s2 and it was supposed to go from 2p6 to 3s2.

I hope this helps

5 0

4 years ago

A car with a mass of 3,500lbs accelerates negatively from 35m/s to 8m/s in 8s. What is the

Salsk061 [2.6K]

Answer:

$a=-3.37\ m/s^2$

Explanation:

Given that,

A car accelerates negatively from 35m/s to 8m/s in 8s.

We need to find the car's acceleration.

Initial speed, u = 35 m/s

Final speed, v = 8 m/s

Time, t = 8 s

The acceleration of an object is equal to the rate of change of velocity. So,

$a=\dfrac{v-u}{t}$

Put all the values,

$a=\dfrac{8-35}{8}\\\\a=-3.37\ m/s^2$

So, the acceleration of the car is equal to $-3.37\ m/s^2$ .

8 0

3 years ago

The following reaction produces ethanoic acid (CHACOOH) from methanol (CH3OH) and carbon

tigry1 [53]

Answer:

$\boxed{\text{300 g}}$

Explanation:

We will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.

M_r: 32 60

CH₃OH + CO ⟶ CH₃COOH

m/g: 160

(a) Moles of CH₃OH

$\text{Moles of CH$_{3}$OH} = \text{160 g CH$_{3}$OH }\times \dfrac{\text{1 mol CH$_{3}$OH }}{\text{32 g CH$_{3}$OH}}= \text{5.00 mol CH$_{3}$OH}$

(b) Moles of CH₃COOH

$\text{Moles of CH$_{3}$COOH} = \text{5.00 mol CH$_{3}$OH } \times \dfrac{\text{1 mol CH$_{3}$COOH}}{\text{1 mol CH$_{3}$OH }} = \text{5.00 mol CH$_{3}$COOH}$

(c) Mass of CH₃COOH

$\text{Mass of CH$_{3}$COOH} =\text{5.00 mol CH$_{3}$COOH} \times \dfrac{\text{60 g CH$_{3}$COOH}}{\text{1 mol CH$_{3}$COOH}} = \textbf{300 g CH$_{3}$COOH}\\\\\text{The maximum mass of ethanoic acid that can be produced is $\boxed{\textbf{300 g}}$}$

3 0

4 years ago

Why might people want to study different rocks and minerals?

Blababa [14]

Answer: because it's nice

Explanation:

7 0

4 years ago

Helppp pleaseee <br> How many hydrogen atoms are indicated by the formula (NH4)2C7H10O2?

Leya [2.2K]

Answer:

The correct answer is - 18.

Explanation:

The number of hydrogen atoms is indicated by the formula (NH4)2C7H10O2 that has two parts (NH4)2 and C7H10O2 then

Number of hydrogen atoms in (NH4)2 = 4*2= 8

number of H atoms in C7H10O2 = 10

then the total number of atoms = 10+8

= 18.

Thus, the correct answer is = 18 hydrogen atoms.

3 0

3 years ago