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soldi70 [24.7K]

3 years ago

9

Since 2000, there have only been five reported cases of this once deadly childhood disease in the United States: diphtheria. Tod

ay, children are vaccinated before they attend school for this ______ disease.
A)
amoebic

B)
bacterial

C)
spirochete

D)
viral

1 answer:

solmaris [256]3 years ago

8 0

D. Viral disease
Because it’s a virus that spreads around to other people and need a vaccine to combat it

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When 231. mg of a certain molecular compound X are dissolved in 65. g of benzene (CH), the freezing point of the solution is mea

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Molar mass X = 18.2 g/mol

Explanation:

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Mass of benzene = 65.0 grams

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Freezing point of pure benzene = 5.5 °C

The freezing point constant for benzene is 5.12 °C/m

Step 2: Calculate molality

ΔT = i*Kf*m

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3 years ago

The density of concentrated nitric acid (HNO3) is 1.413 g/mL. What volume in liters would be occupied by a mass of 47.2 g?

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Answer:

The volume that a mass of 47.2 g would occupy is 0.0334 L

Explanation:

Density is the property that matter, whether solid, liquid or gas, has to compress into a given space. Density is defined as the amount of mass it has per unit volume, that is, the ratio between the mass of a body and the volume it occupies:

$Density=\frac{mass}{volume}$

This indicates that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case:

density= 1.413 g/mL
mass= 47.2 g
volume=?

Replacing:

$1.413 \frac{g}{mL}=\frac{47.2 g}{volume}$

Solving:

$volume=\frac{47.2 g}{1.413\frac{g}{mL} }$

volume=33.40 mL

Being 1,000 mL= 1 L:

volume= 0.0334 L

<u><em> The volume that a mass of 47.2 g would occupy is 0.0334 L</em></u>

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4 years ago