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anygoal [31]
3 years ago
13

:) hi,can you help me its really easy

Chemistry
1 answer:
yaroslaw [1]3 years ago
3 0
Ultraviolet rays is the answer
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Determine the mass of 2.4 x 10^24 atoms of gold?​
Scorpion4ik [409]

Answer:

Mass = 785.9 g

Explanation:

Given data:

Atoms of gold = 2.4 × 10²⁴ atoms

Mass of gold = ?

Solution:

First of all we will convert the number of atoms into moles.

2.4 × 10²⁴ atoms × 1 mol/ 6.02 × 10²³ atoms

number of moles = 3.99 mol

Now we will determine the mass of gold.

Mass = number of moles × molar mass

Mass =  3.99 mol × 196.97 g/mol

Mass = 785.9 g

8 0
3 years ago
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The specific heat (Cp) of glass is 0.5J/g C. a 61.3g piece of glass absorbs 1200 J of heat. What a the change in temperature?
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Find the ph of a buffer that consists of 0.18 m ch3nh2 and 0.73 m ch3nh3cl (pkb of ch3nh2 = 3.35)?
ozzi
Hello!

First, we need to determine the pKa of the base. It can be found applying the following equation:

pKa=14-pKb=14-3,35=10,65

Now, we can apply the Henderson-Hasselbach's equation in the following way:

pH=pKa+log( \frac{[CH_3NH_2]}{[CH_3NH_3Cl]} )=10,65+log( \frac{0,18M}{0,73M} )=10,04

So, the pH of this buffer solution is 10,04

Have a nice day!
8 0
3 years ago
Consider chemical reactions between main group metals and non-metals. Based on known bonding patters, which of the following com
Fittoniya [83]

Answer:

You didn't list the compounds it gave you so i cant cross check them to see it they are ionic bonds( which is  the chemical bonding is formed between metal and nonmetal)

if you reply with the compounds it list I will be happy to check for you

4 0
2 years ago
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