Answer:
94.4g/mol is molar mass of the unknown
Explanation:
Based on the freezing point depression equation:
ΔT = Kf*m*i
<em>Where ΔT is the depression in freezing point (1.87°C)</em>
<em>Kf is freezing point depression constant of water (1.86°Ckg/mol)</em>
<em>And i is Van't Hoff factor (1 for nonelectrolyte solutes)</em>
<em />
Replacing:
1.87°C = 1.86°CKg/mol*m*i
1.005mol/kg solvent = m
Using the mass of the solvent we can find the oles of the nonelectrolyte:
1.005mol/kg solvent * 0.4764kg = 0.479moles
Molar mass is defined as the ratio between mass of a substance in grams and moles, that is:
45.2g / 0.479mol =
<h3>94.4g/mol is molar mass of the unknown</h3>
Answer:
Avogadro number of pennies will extend to a distance of 6.02 * 10¹⁷ km
<em>Note: The question is missing some parts. The complete question is as follows;</em>
<em>A penny has a thickness of approximately 1.0 mm . If you stack ed Avogadro's number of pennies one on top of the other on Earth 's surface, how far would the stack extend (in km)? [For comparison, the sun is about 150 million km from Earth and the nearest star (Proxim a Centauri) is about 40 trillion km from Earth.]</em>
Explanation:
Avogadro number = 6.02 * 10²³
thickness of a penny = 1.0 mm
I mm = 0.001 m
Thickness of Avogadro number of pennies stacked one upon another will be:
6.02 * 10²³ * 0.001 m = 6.02 * 10²⁰ m
Distance in km;
1 m = 0.001 km
therefore, 6.02 * 10²⁰ m = 6.02 * 10²⁰ * 0.001 km = 6.02 * 10¹⁷ km
Avogadro number of pennies will extend to a distance of 6.02 * 10¹⁷ km
Beaker of water i guess because usually at home when i get out cold water i put in my room and it cools fast for me so..... i think
The answer to you’re question is C. NH3
Inhaled allergies will have the slowest onset time in an allergic reaction.
Inhaled allergies are also known as delayed-type hypersensitivity of allergic reactions because they occur after at least 24 hours of exposure to an allergen.
These reactions usually occur 48 to 72 hours or more to get exposure after contact with the allergen. Respiratory allergies are the most common type of allergy. Symptoms may include:
- sneezing
- runny nose
- watery eyes
- itchy eyes
Many people with inhaled allergies only have symptoms at certain times of the year. Pollen, grass, and mold are the most common triggers for seasonal allergies.
Many types of airborne allergens are prevalent indoors.
- Fungi
- Molds
- Animal
- dander
- Mites
Many long-term infectious diseases, such as tuberculosis and fungal infections are its examples.
Learn more about Inhaled allergies here : brainly.com/question/7290086
#SPJ4
