All categories

4 years ago

The atomic weight of Ga is 69.72 amu. There are only two naturally occurring isotopes of gallium:

Chemistry

1 answer:

irga5000 [103]4 years ago

3 0

Answer:

71 Ga has a naturally abundance of 36%

Explanation:

Step 1: Given data

Gallium has 2 naturally occurring isotopes: this means the abundance of the 2 isotopes together is 100 %. The atomic weight of Ga is 69.72 amu. This is the average of all the isotopes.

Since the average mass of 69.72 is closer to the mass of 69 Ga, this means 69 Ga will be more present than 71 Ga

Percentage 69 Ga> Percentage 71 Ga

Step 2: Calculate the abundance %

⇒Percentage of 71 Ga = X %

⇒Percentage of 69 Ga = 100 % - X %

The mass balance equation will be:

100*69.72 = x * 71 + (100 - x)*69

6972 = 71x + 6900 -69x

72 = 2x

x = 36 %

71 Ga has a naturally abundance of 36%

69 Ga has a naturally abundance of 64%

You might be interested in

Calculate the vapor pressure in torr of a solution containng 24.5 g of glycerin (C3H8O3) in 135 mL water at 30.0* C; the vapor p

Otrada [13]

Psolution = X · PH_20
= 0.966 · 31.8 torr
= 30.7 torr

3 0

2 years ago

How many grams of methane gas (CH4) need to be combusted to produce 12.5 L water vapor at 301 K and 1.1 atm? Show all of the wor

tangare [24]

Answer is: 4.45 grams of methane gas need to be combusted.
Balanced chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.
Ideal gas law: p·V = n·R·T.
p = 1.1 atm.
T = 301 K.
V(H₂O) = 12.5 L.
R = 0,08206 L·atm/mol·K.
n(H₂O) = 1.1 atm · 12.5 L ÷ 0,08206 L·atm/mol·K · 301 K.
n(H₂O) = 0.556 mol.
From chemical reaction: n(H₂O) : n(CH₄) = 2 : 1.
n(CH₄) = 0.556 mol ÷ 2 = 0.278 mol.
m(CH₄) = 0.278 mol · 16 g/mol.
m(CH₄) = 4.448 g.

4 0

3 years ago

*10 points* PLS HELP!!!!!!!!!!!!!!!!

CaHeK987 [17]

Aluminum foil I think but if not goodluck :)

5 0

3 years ago

Read 2 more answers

Acetylene (C2H2) gas is often used in welding torches because of the very high heat produced when it reacts with oxygen (O2) gas

babymother [125]

Answer:

0.05 mol

Explanation:

The balanced equation for the reaction that takes place is:

2C₂H₂ (g) + 5O₂ (g) → 4CO₂ (g) + 2H₂O (g)

Now we convert 0.10 moles of carbon dioxide (CO₂) into moles of acetylene (C₂H₂), using the stoichiometric coefficients of the balanced reaction:

0.10 mol CO₂ * $\frac{2molC_2H_2}{4molCO_2}$ = 0.05 mol C₂H₂

7 0

3 years ago

The particles of a gas inside a balloon are experiencing an increase in the average kinetic energy and the number of collisions

Sever21 [200]

Answer:

1. Higher gas pressure inside the balloon.

Explanation:

An increase in the average kinetic energy and the number of collisions represents increases on gas temperature and pressure inside the ballon. Hence, the answer is 1.

6 0

3 years ago