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3 years ago

How many atoms of Ca are in 4.7 moles of calcium?

Chemistry

1 answer:

Basile [38]3 years ago

6 0

Answer: There are $28.303 \times 10^{23}$ atoms in 4.7 moles of calcium.

Explanation:

According to Avogardo's number for every 1 mole of a substance there will be $6.022 \times 10^{23}$ atoms.

For the given Ca atom there are 4.7 moles. Hence the number of atoms present in 4.7 moles will be calculated as follows.

Moles present = $4.7 \times 6.022 \times 10^{23}$ atoms

= $28.303 \times 10^{23}$ atoms

Thus, we can conclude that there are $28.303 \times 10^{23}$ atoms in 4.7 moles of calcium.

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Which substance can be decomposed by a chemical change? (1) Co (3) Cr(2) CO (4) Cu

kotykmax [81]

Answer: (2) CO

Co, Cr, and Cu are elements. Elements cannot be broken down by a chemical change, but compounds can. Since CO is a compound, it can be decomposed by a chemical change.

7 0

3 years ago

Consider the following reaction where Kc = 1.80×10-2 at 698 K:2 HI (g) H2 (g) + I2 (g)A reaction mixture was found to contain 0.

Iteru [2.4K]

Answer:

Answer for the given statements: (1) T , (2) F , (3) T , (4) F , (5) F

Explanation:

At the given interval, concentration of HI = $\frac{0.304}{1}M=0.304M$

Concentration of $H_{2}$ = $\frac{5.07\times 10^{-2}}{1}M=5.07\times 10^{-2}M$

Concentration of $I_{2}$ = $\frac{4.57\times 10^{-2}}{1}M=4.57\times 10^{-2}M$

Reaction quotient, $Q_{c}$ , for this reaction = $\frac{[H_{2}][I_{2}]}{[HI]^{2}}$

species inside third bracket represents concentrations at the given interval.

So, $Q_{c}=\frac{(5.07\times 10^{-2})\times (4.57\times 10^{-2})}{(0.304)^{2}}=2.51\times 10^{-2}$

So, the reaction is not at equilibrium.

As $Q_{c}> K_{c}$ therefore reaction must run in reverse direction to reduce $Q_{c}$ and make it equal to $K_{c}$ . That means HI(g) must be produced and $H_{2}$ must be consumed.

3 0

3 years ago

As a bond netween a hydrohen atom and sulfur atom is formed, electrons are

aleksley [76]

shared to form an ionic bond.

I hope this helps!

7 0

3 years ago

Since volume and temperature are constant, this means that pressure and_____are____proportional. the sample with the largest____

IceJOKER [234]

Since volume and temperature are constant, this means that pressure and number of moles are directly proportional. the sample with the largest number of moles will have the high pressure.

Since, the ideal gas equation is also called ideal gas law. So, according to ideal gas equations,

PV = nRT

P is pressure of the sample
T is temperature
V is volume
n is the number of moles
R is universal gas constant

At constant volume and temperature the equation become ,

P ∝ nR

since, R is also constant. So, conclusion of the final equation is

P ∝ n

The number of moles and pressure of the sample is directly proportion. So, on increasing number of moles in the sample , pressure of the sample also increases.

learn about ideal gas law

brainly.com/question/4147359

#SPJ4

5 0

2 years ago

What is the concentration of Htions at a pH = 11?

Lostsunrise [7]

Answer:
a) 1 x 10^-11 mol/L
b) 1 x 10^-6 mol/L
c) 1 x 10^-5 fewer H+ ions

Explanation

pH stands for Power of Hydrogen, the more acidic a substance is, the more H+ ions it has rendering the substance acidic. a pH of 1 means the concentration of H+ ions is 1 x 10^-1. A pH of 7 means the concentration of H+ ions is 1 x 10^-7 and so on.

10^-11 has 10^-5 more H+ ions than 10^-6

Hope this helps :)

5 0

3 years ago