3 years ago

Help please I need help with these two questions answer truthfully get brainliest?!!

Chemistry

2 answers:

irina1246 [14]3 years ago

5 0

Answer:

1. 3x-3=18

Value of x=7

2. 4x-5=23

value of x=7

My name is Ann [436]3 years ago

5 0

Answer:

b 7 for one

a 3 for two

Explanation:

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Help plz! im not understanding

valina [46]

a is 8.46 × 10^5

b is 3 ×10^-2

Explanation:

i hope this helps

4 0

3 years ago

How many copper atoms are in 70g of copper

Elanso [62]

Answer:

$n = 6.634\times 10^{23}\,atoms$

Explanation:

The total amount of atoms is found by multiplying Avogradro's Number and the number of moles:

$n = \left(6.022\times 10^{23}\,\frac{atoms}{mol} \right)\cdot \left(\frac{70\,g}{63.546\,\frac{g}{mol} } \right)$

$n = 6.634\times 10^{23}\,atoms$

4 0

4 years ago

answer now please Which device can be used to separate nails from sawdust most efficiently? A. strainer B. magnet C. colander D.

e-lub [12.9K]

A magnet because it will remove only metal and not the saw dust

Hope this helps

6 0

3 years ago

Read 2 more answers

If an atom has 34 protons and 40 neutrons, what is its mass number? 40 6 74 34

Darya [45]

Protons+Neutrons
34+40= 74

7 0

4 years ago

Read 2 more answers

Will mark brainliest if correct

AURORKA [14]

Answer:

filtration and chromatography

Explanation:

I hope this will help you :-)

7 0

3 years ago

Help please I need help with these two questions answer truthfully get brainliest?!!​

Help please I need help with these two questions answer truthfully get brainliest?!!