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3 years ago

12

If a neutral compound is composed of carbon and hydrogen and you know that it has exactly 2 carbons connected by a double bond,

how many hydrogens will the compound have?
A. 4
B. 8
C. 2
D. 6

1 answer:

Ivahew [28]3 years ago

3 0

Answer:

B. 8

Explanation:

because I learned that in 6th

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Antimony pentafluoride has a formula of SbF5. What is the percent composition of Sb in this molecule

Akimi4 [234]

Answer:

56.17% is percent composition of Sb in the molecule

Explanation:

Percent composition is the percent in mass of each element present in a particular molecule.

In SbF₅, there is 1 mole of Antimony -Molar mass: 121.76g- per 5 moles of fluorine -Molar mass: 19g/mol-. In a basis of 1 mole, the mass of Sb and F is:

<em>Mass Sb:</em>

1mol * (121.76g/mol) = 121.76g

<em>Mass F:</em>

1 mol SbF₅ = 5 moles F * (19g / mol) = 95g

<em>Total mass:</em>

121.76g + 95g = 216.76g

And percent composition of Sb:

121.76g / 216.76g * 100 =

<h3>56.17% is percent composition of Sb in the molecule</h3>

7 0

2 years ago

The equilibrium constant for the following reaction: H2(g) + Br2(g) ↔ 2HBr (g) is 1.65 x 103 at a certain temperature. Find the

Aleks [24]

Answer:

6.97 atm was the equilibrium pressure of HBr .

Explanation:

The value of the equilibrium constant = $K_p=1.65\times 10^3$

$H_2+Br_2\rightleftharpoons 2HBr$

Initially:

0 0 7.10 atm

At equilibrium

x x (7.10-2x)

The expression of equilibrium constant can be written as:

$K_p=\frac{p_{HBr}}{p_{H_2}\times p_{Br_2}}$

$1.65\times10^3=\frac{(7.10-2x)}{x^2}$

Solving for x:

x = 0.065

Partial pressure of HBr at equilibrium :(7.10 - 2 × 0.065) atm = 6.97 atm

6.97 atm was the equilibrium pressure of HBr .

7 0

2 years ago

How many moles of sodium bicarbonate are in 1.50 kg of the compound?

salantis [7]

Answer:

n=17.85 moles

Explanation:

Given mass is, m = 1.5 kg = 1500 g

The molar mass of sodium bicarbonate is, M = 84.007 g/mol

We need to find the no of moles in 1.5 kg of Sodium bicarbonate . We know that, no of moles is equal to given mass divided by molar mass.

$n=\dfrac{m}{M}\\\\n=\dfrac{1500}{84.007 }\\\\n=17.85$

<h2>So, there are 17.85 moles in 1.5 kg of Sodium bicarbonate.</h2>

3 0

3 years ago

coldgirl [10]

D. The nucleus is the control center of the cell

6 0

3 years ago

Calculate the answer. Express it in scientific notation and include the correct number of significant figures. (12 x 104 ) x (5

ipn [44]

Answer:

Explanation:

(12 x 104 ) x (5 x 10-²) = 6 x 10 ³ 6 x 105 6.0x10²

1. (12 x 104 ) = 1248 or 1.248 x 10^3

2. (1.248 x 10^3)(5 x 10^-2) = 6.240 x 10^1 or 60 rounded to 1 sig fig

I don't understand "= 6 x 10 ³ 6 x 105 6.0x10² "

6 0

1 year ago