3 years ago

I need help with number 8 and fast it's due tomorrow. :)

Chemistry

1 answer:

EastWind [94]3 years ago

3 0

Nuetrons+protons. and number 7 is electrons and protons

You might be interested in

How many moles are in 7.1x10^21 atoms of iron?

Nitella [24]

Answer:

0.011 moles

Explanation:

There are about 6.02*10^23 atoms in a mole, so in the given sample, there are

$\frac{7.01 \times {10}^{21} }{6.02 \times {10}^{23} }$

which is about 0.011 moles.

8 0

3 years ago

5 uses of chemistry

Vikentia [17]

Teaching
Medicine
Engineering
Industry
Aviation

6 0

3 years ago

As with other ionic compounds, potassium bromate, KBrO3, dissociates into ions when it dissolves in water. If 13.8 g of KBrO3 is

chubhunter [2.5K]

Answer:

ΔH of dissociation is 38,0 kJ/mol

Explanation:

The dissociation reaction of KBrO₃ is:

KBrO₃ → K⁺ + BrO₃⁻ 

This dissolution consume heat that is evidenced with the decrease in water temperature.

The heat consumed is:

q = CΔTm

Where C is specific heat of water (4,186 J/mol°C)

ΔT is the temperature changing (18,0°C - 13,0°C = 5,0°C)

And m is mass of water (150,0 mL ≈ 150,0 g)

Replacing, heat consumed is:

q = 3139,5 J ≡ 3,14 kJ

13,8 g of KBrO₃ are:

13,8 g×(1mol/167g) = 0,0826 moles

Thus, ΔH of dissociation is:

3,14kJ / 0,0826mol = 38,0 kJ/mol

I hope it helps!

3 0

3 years ago

What actions show conserving by reusing? Choose the two correct answers

hram777 [196]

A and D

Hope this helps

3 0

3 years ago

Convert 1.5 km to millimeters, and express the result in scientific notation.

Grace [21]

The answer is 1.5e+6. Hope this helped!

7 0

3 years ago