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victus00 [196]
3 years ago
10

Percent composition and empirical formula problems Show all your work when solving the following problems. Be sure to include un

its and label your answer.
1. Find the empirical formula of a compound containing 32.0 g of bromine and 4.9 g of magnesium.
Chemistry
1 answer:
yan [13]3 years ago
6 0

Answer:

MgBr₂

Explanation:

Here we need to find the molar proportions of the two elements which will give us the empirical formula of the compound. To do that,we need  to determine the number of moles the grams given represent, and then convert them to whole numbers to find their proportions.

Atomic weght Br = 79.904 g/mol mol

⇒ mol Br = 32.0 g/ 79.904 g/mol = 0.40 mol

Atomic weight Mg = 24.305 g/mol  

⇒ mol Mg = 4.9 g/24.305 g/mol = 0.20 mol

Their proportions are

0.40 Br ÷ 0.20 Mg = 2 Br ÷ 1 Mg

Empirical formula = MgBr₂

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2C4H10+13O2-->8CO2+10H2O Using the predicted and balanced equation, How many Liters of CO2 can be produced from 150 grams of
Anna11 [10]

Answer:  233 L of CO_2 will be produced from 150 grams of  C_4H_{10}

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}  \text{Moles of} C_4H_{10}=\frac{150g}{58g/mol}=2.59moles

The balanced chemical equation is:

2C_4H_{10}+13O_2(g)\rightarrow 8CO_2+10H_2O  

According to stoichiometry :

2 moles of C_4H_{10} produce =  8 moles of CO_2

Thus 2.59 moles of C_4H_{10} will produce=\frac{8}{2}\times 2.59=10.4moles  of CO_2  

Volume of CO_2=moles\times {\text {Molar volume}}=10.4moles\times 22.4mol/L=233L

Thus 233 L of CO_2 will be produced from 150 grams of  C_4H_{10}

8 0
4 years ago
Compute the equilibrium constant for the spontaneous reaction between
Reptile [31]

Answer:

9.8 × 10^21

Explanation:

Equation of the reaction;

Cd(s) + Ni^2+(aq) ----> Cd^2+(aq) + Ni(s)

E°cell= E°cathode - E°anode

E°cathode= -0.25 V

E°anode = -0.40 V

E°cell= -0.25 - (-0.40)

E°cell = 0.65 V

∆G= -nFE°cell

∆G= -(2 × 96500 × 0.65)

∆G = -125450 J

From;

∆G= -RTlnK

lnK = ∆G/-RT

K= e^∆G/-RT

K= e^-[-(125450/8.314 × 298)]

K= 9.78 × 10^21

5 0
4 years ago
Someone plz tell me this
Hatshy [7]
This. You welcome now can you plz give me thanks and brainly
3 0
3 years ago
What is the the atomic mass of carbon-14
vfiekz [6]
Pretty sure it's 6 the atomic mass
4 0
4 years ago
Read 2 more answers
Which type of bond stores the most energy
Ronch [10]

Answer:

I'm not sure which bond stores the most energy but the ionic bond is stronger than the covalent bond.

Explanation:

7 0
3 years ago
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