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vladimir1956 [14]
2 years ago
13

Caulculate the number of mass of 0.25 mol of carbon dioxide molecules

Chemistry
1 answer:
navik [9.2K]2 years ago
8 0
Mass = number of moles x molar mass

carbon dioxide: CO2

mass = 0.25 x (12 + 16 + 16)
mass = 0.25 x 44
mass = 11g
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How many atoms are in 187 g of Calcium?
N76 [4]
Atomic mass Calcium ( Ca) = 40.078 u.m.a

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187 g ------------------- ??

187 x ( 6.02x10²³) / 40.078 =

1.125x10²⁶ / 40.078 = 2.808x10²⁴ atoms

hope this helps!




4 0
3 years ago
Where is a divergent boundary most likely to be found?
nexus9112 [7]

Answer:

a

Explanation

Bc I took the test, good luck with that guys

7 0
2 years ago
The lock-and-key model and the induced-fit model are two models of enzyme action explaining both the specificity and the catalyt
ivolga24 [154]

Answer:

The lock-and-key model:

c. Enzyme active site has a rigid structure complementary

The induced-fit model:

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b. Substrate binds to the enzyme at the active site, forming an enzyme-substrate complex.

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Explanation:

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4 0
3 years ago
Round 129.752416 to the requested number of significant figure a. 3 significant figures c. 6 significant figures_22 b. 4 signifi
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5 0
3 years ago
Question a chemist mixes 35 milliliters of a solution that is 18% acid with 90 milliliters of a solution that is 68% acid. answe
Allushta [10]
Missing questions: 
<span>a) How many milliliters of acid are in the resulting mixture?
b) What percentage of the resulting mixture is acid?
a) V</span>₁ = 35 ml.
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V₂ = 90 ml.
ω₂ = 68% = 0,68.
V(acid) = V₁ · ω₁ + V₂ · ω₂.
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b) ω(acid) = 67,5 ml ÷ (35 ml + 90 ml).
ω(acid) = 54%.
8 0
3 years ago
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