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Viefleur [7K]
3 years ago
7

I just need to know the answer for six please and thank you!

Chemistry
1 answer:
nydimaria [60]3 years ago
8 0

Answer:

Explanation:

3(NH₄)₂Cr₂O₇

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A compound is formed when 12.2 g Mg combines completely with 5.16 g N. What is the percent composition of this compound? Please
Debora [2.8K]
3Mg + N₂= Mg₃N₂
n(Mg)=12,2g÷24,4g/mol=0,5mol-limiting reagentn
(N₂)=5,16g÷28g/mol=0,18mol
n(Mg₃N₂):n(Mg)=1:3, n(Mg₃N₂)=0,166mol, m(Mg₃N₂)=0,166·101,2=16,8g.
%(N)= 2·Ar(N)÷Mr(Mg₃N₂) = 2·14÷101,2=27,66%=0,2766
%(Mg) = 3·Ar(Mg)÷Mr(Mg₃N₂)= 3·24,4÷101,2=72,34% or 100% - 27,66%= 72,34%.
8 0
3 years ago
Which .1 M solution has a pH greater than 7
ElenaW [278]

Answer:

KOH for which PH= 13

Explanation:

5 0
3 years ago
Would you expect the actual yield to be larger or smaller than the theoretical yield? Explain.
docker41 [41]
Smaller, there are many human and systematic errors that can alter the amount of product that can be obtained. 
3 0
3 years ago
The equilibrium constant for the reaction
FinnZ [79.3K]

Answer: The concentrations of Cl_2 at equilibrium is 0.023 M

Explanation:

Moles of  Cl_2 = \frac{\text {given mass}}{\text {Molar mass}}=\frac{10g}{71g/mol}=0.14mol

Volume of solution = 1 L

Initial concentration of Cl_2 = \frac{0.14mol}{1L}=0.14M

The given balanced equilibrium reaction is,

                            COCl_2(g)\rightleftharpoons CO(g)+Cl_2(g)

Initial conc.           0.14 M           0 M       0M    

At eqm. conc.     (0.14-x) M        (x) M        (x) M

The expression for equilibrium constant for this reaction will be,

K_c=\frac{[CO]\times [Cl_2]}{[COCl_2]}

Now put all the given values in this expression, we get :

4.63\times 10^{-3}=\frac{x)^2}{(0.14-x)}

By solving the term 'x', we get :

x = 0.023 M

Thus, the concentrations of Cl_2 at equilibrium is 0.023 M

7 0
3 years ago
Please do ALL 3 parts correctly for brainiest,thank you on question and profile and 5-star rating
erica [24]

Answer:

a) longitudnal waves

b)parallel to vibration

c) transverse waves .it is used in a ripple tank

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