In chemical reactions, what does the law of conservation of mass mean?Group of answer choices
Matter is not created nor destroyed.
The total mass of the products is greater than the total mass of the reactants.
The total mass of the reactants is less that the total mass of the products.
Matter is not changed.
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Answer
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
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Sulfurous acid is a diprotic acid with the following acid-ionization constants: Ka1 = 1.4x10−2, Ka2 = 6.5x10−8 If you have a 1.0 L buffer containing 0.252 M NaHSO3 and 0.139 M Na2SO3, what is the pH of the solution after addition of 50.0 mL of 1.00 M NaOH? Enter your answer numerically to 4 decimal places.
If you want to melt ice into liquid water, does the ice absorbs heat or release heat? Is this endothermic or exothermic?
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The mass of air in room as per given density is 53.2 kg.
To calculate the mass of air contained in a room, we can use the formula:
mass = density x volume
Here, the given density of air is 1.29 g/dm³ at 25°C. We can convert the dimensions of the room to decimeters (dm) by multiplying by 10:
Length = 2.50 m × 10 = 25 dm
Width = 5.50 m × 10 = 55 dm
Height = 3.00 m × 10 = 30 dm
Now, we can calculate the volume of the room by multiplying the three dimensions:
Volume = length x width x height
Volume = 25 dm x 55 dm x 30 dm
Volume = 41,250 dm³
Finally, we can use the formula to calculate the mass of air:
mass = density x volume
mass = 1.29 g/dm³ x 41,250 dm³
mass = 53,212.5 g or 53.2 kg
Therefore, the mass of air contained in the room is approximately 53.2 kg.
Learn more about density,here:
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Explanation:
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The total mass of the solution of lithiumnitrate solution has been 99.7 grams.
Density can be defined as the mass of the solute per unit volume. The density can be expressed as g/ml or kg/L.
The mass of given Lithium nitrate = 2.5 grams.
The mass of water can be given as:
Density =
Volume of water = 97.2 ml.
The total mass of solution:
Mass of water = Density Volume
Mass of water = 1 97.2 grams
Mass of water = 97.2 grams
The total mass = Mass of lithium nitrate + mass of water
= 2.5 + 97.2 grams
= 99.7 grams.
The total mass of the solution of lithiumnitrate solution has been 99.7 grams.
For more information about density, refer to the link:
Answer:
The total mass of the solution = 99.7 g
Note: The question is incomplete. The complete question is given below:
A "coffee-cup" calorimetry experiment is run for the dissolution of 2.5 g of lithium nitrate placed into 97.2 mL of water. The temperature of the solution is initially at 23.5oC. After the reaction takes place, the temperature of the solution is 28.3 oC.
1. Using a density of 1.0 g/mL for the water added and adding in the mass of the lithium nitrate, what is the total mass of the solution and solid?
Explanation:
mass = density * volume
density of water = 1.0 g/mL; volume of water = 97.2 mL
mass of water = 1.0 g/L * 97.2 mL
mass of water = 97.2 g
mass of lithium nitrate = 2.5 g
A solution is made by dissolving a solute (usually solid) in a solvent (usually a liquid). The solute in this reaction is lithium nitrate and the solvent is water.
Total mass of solution = mass of water + mass of lithium nitrate
Total mass of solution = 97.2 g + 2.5 g = 99.7 g
Therefore, total mass of the solution = 99.7 g
Answers
Answer:
Stoichiometric coefficient of hydrogen gas is 1.
Stoichiometric coefficient of palmitic acid is 1.
Explanation:
Addition of hydrogen to double bond is termed as hydrogenation reaction.
According to stoichiometry, 1 mole of palmitoleic acid reacts with 1 mole of hydrogen gas to give 1 mole of palmitic acid.
Stoichiometric coefficient of hydrogen gas is 1.
Stoichiometric coefficient of palmitic acid is 1.
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If, Electronegativity difference is,
Less than 0.4 then it is Non Polar Covalent
Between 0.4 and 1.7 then it is Polar Covalent
Greater than 1.7 then it is Ionic
For P and Cl,
E.N of Chlorine = 3.16
E.N of Phosphorous = 2.19
________
E.N Difference 0.97 (Polar Covalent)
For K and Br,
E.N of Bromine = 2.96
E.N of Potassium = 0.82
________
E.N Difference 2.14 (Ionic)
For C and C,
E.N of Carbon = 2.55
E.N of Carbon = 2.55
________
E.N Difference 0.00 (Non-Polar Covalent)
a) sulphur
b) iron
c) ammonia
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Answer:
Ammonia is a compound.
Explanation:
A compound is composed of two or more separate elements. Ammonia is NH3, which happens to be two different elements.
Answers
Vascular tissue
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Cross section of celery stalk, showing vascular bundles, which include both phloem and xylem.
Detail of the vasculature of a bramble leaf.
Translocation in vascular plants
This article is about vascular tissue in plants. For transportation in animals, see Circulatory system.
Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally. There are also two meristems associated with vascular tissue: the vascular cambium and the cork cambium. All the vascular tissues within a particular plant together constitute the vascular tissue system of that plant.
The cells in vascular tissue are typically long and slender. Since the xylem and phloem function in the conduction of water, minerals, and nutrients throughout the plant, it is not surprising that their form should be similar to pipes. The individual cells of phloem are connected end-to-end, just as the sections of a pipe might be. As the plant grows, new vascular tissue differentiates in the growing tips of the plant. The new tissue is aligned with existing vascular tissue, maintaining its connection throughout the plant. The vascular tissue in plants is arranged in long, discrete strands called vascular bundles. These bundles include both xylem and phloem, as well as supporting and protective cells. In stems and roots, the xylem typically lies closer to the interior of the stem with phloem towards the exterior of the stem. In the stems of some Asterales dicots, there may be phloem located inwardly from the xylem as well.
Between the xylem and phloem is a meristem called the vascular cambium. This tissue divides off cells that will become additional xylem and phloem. This growth increases the girth of the plant, rather than it