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Alika [10]
3 years ago
10

While investigating greenhouse gases, I measured 0.1875 grams of carbon dioxide in a 500-gram sample of the atmosphere. What is

the concentration of CO₂ in the atmospheric sample?
Chemistry
1 answer:
Harlamova29_29 [7]3 years ago
6 0

Answer:

[CO₂] = 375 ppm

Explanation:

We can determine the concentration in value of ppm

ppm = mass of solute (mg) / mass of solution (kg)

Solution: atmosphere

Solute: CO₂

We convert the mass of CO₂ from g to mg → 0.1875 g . 1000 mg / 1g = 187.5 mg

We convert the mass of the atmosphere from g to kg: 500 g . 1 kg/1000g = 0.500 kg

ppm = 187.5 mg / 0.500kg = 375

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1.50μm2. Convert this to square meters.
mars1129 [50]
Based on the standards of units conversion, to convert from micrometer to meter, we multiply by 10^-6.
Since we there is a square (10^2) to consider, then to convert from micrometer squared to meter squared, we will multiply by (10^-6)^2 as follows:
1.5 <span>μm2 = 1.5 x (10^-6)^2 = 1.5 x 10^-12 meter sqaures</span>
6 0
3 years ago
A Rolaids tablet contains calcium for neutralizing stomach acid. if a Rolaids tablet neutralizes 24.65ml of 0.547m hydrochloric
Lelu [443]

There are 674 mg of calcium carbonate in a Rolaids tablet

<h3>Further explanation</h3>

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

\tt 24.65\times 0.547=13.48~mlmol

ratio mol CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

\tt \dfrac{1}{2}\times 13.48=6.74~mlmol=6.74\times 10^{-3}~mol

mass of CaCO₃ (MW=100~g/mol) :

\tt 6.74\times 10^{-3}\times 100=0.674~g=674~mg

4 0
2 years ago
What do you observe when you move two hydrogen atoms closer together?
Darya [45]
1-They will form the weakest bond.
2-The energy between them begins to decrease as they get closer, and it reaches the minimum when the two atoms are at an optimum distance apart. 
3-But once the two atoms forced closer together, So the energy rapidly increases
7 0
3 years ago
Consider the following chemical equilibrium: Now write an equation below that shows how to calculate from for this reaction at a
borishaifa [10]

Answer:

Kp=Kc *(RT)+-3

Explanation:

The relation between Kp and Kc is given below:

Where,

Kp is the pressure equilibrium constant

Kc is the molar equilibrium constant

R is gas constant , R = 0.082057 L atm.mol⁻¹K⁻¹

T is the temperature in Kelvins

Δn = (No. of moles of gaseous products)-(No. of moles of gaseous reactants)

For the first equilibrium reaction:

Δn = (0)-(2+1) = -3

Thus, Kp is:

Kp=Kc *(RT)+-3

6 0
2 years ago
What element has a mass number of 138 and protons equal to 57?
Murljashka [212]


Basic Information
Name:<span> Lanthanum </span>
Symbol:<span> La </span>
Atomic Number:<span> 57 </span>
Atomic Mass:<span> 138.9055 amu </span>
Melting Point:<span> 920.0 °C (1193.15 K, 1688.0 °F) </span>
Boiling Point:<span> 3469.0 °C (3742.15 K, 6276.2 °F) </span>
Number of Protons/Electrons:<span> 57 </span>
Number of Neutrons:<span> 82 </span>
Classification: Rare Earth 
Crystal Structure:<span> Hexagonal </span>
Density @ 293 K:<span> 6.7 g/cm</span>3 
Color:<span> white

</span>
6 0
3 years ago
Read 2 more answers
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