What is the molar mass for the following compound , rounded to the nearest gram ? Na2S2O3

Answers

Answer 1

Answer: mass of Na = 23 u
mass of S = 32 u
mass of oxygen = 16 u

Thus, Na2S2O3

= 23(2) + 32(2) + 16(3)

= 46 + 64 + 48

= 110 + 48
= 158 u.

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Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?

Answers

I believe this would be Avogadro's law which states ''Equal volumes of all gases, at the same temperature and pressure, have the same number of molecules regardless of their chemical nature and physical properties.''

Answer:

boyles law

Explanation:

Mercury-197 has a half life of 3 days. Starting with 300 grams, how much remains in 3 weeks? (Round to two places)

Answers

each > = 3 days
300g > 150g > 75g > 37.5g > 18.75g > 9.375g > 4.6875g > 2.34375g
Thus,mass remaining = 2.34g(2 d.p.)

Which of the following combinations would result in the largest attractionbetween particles?
Large charges close together
Small charges close together
Large charges far apart from each other
OSmall charges far apart from each other

Answers

Answer:

Explanation:

Large charges close together maybe

A molecule of an organic compound contains at least one atom of(1) carbon (3) nitrogen
(2) chlorine (4) oxygen

Answers

Answer: (1) carbon

Explanation: Organic compounds are those compounds which contains a carbon atom. Nearly all organic compounds contain hydrogen and some of the organic compounds contain oxygen. Example: Glucose( $C_6H_(12)O_6$ ), Methane ( $CH_4$ )

Inorganic compounds are those compounds which do not contain a carbon atom. Example : $NaCl$

Final answer:

An organic compound, by definition, must contain at least one carbon atom. Other elements such as nitrogen, chlorine, and oxygen can also be part of organic compounds, but they're not a requirement. An example of an organic compound is methane, which contains one carbon atom and four hydrogen atoms. The correct option is 1.

Explanation:

An organic compound is a type of molecule characterized by its carbon-based structure. By definition, an organic compound contains at least one carbon atom, which is option (1) in your question.

Although organic compounds can also contain atoms of nitrogen, chlorine, oxygen, and several other elements, these are not a requisite for a compound to be considered organic. The key component, fundamentally speaking, is carbon.

For instance, methane (CH4) is an example of an organic compound. It includes one carbon atom and four hydrogen atoms.

On the other hand, carbon dioxide (CO2), which contains one carbon atom and two oxygen atoms, is not considered an organic compound, even though it contains carbon, because it doesn't contain any carbon-hydrogen bonds, which are typically found in organic compounds.The correct option is 1.

Learn more about Organic Compounds here:

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How many milliliters of 0.02 M HCl are needed to react completely with 100 mL of 0.01 M NaOH?A) 200 mL
B) 100 mL
C) 75 mL
D) 50 mL
E) 25 mL

Answers

Answer: Option (D) is the correct answer.

Explanation:

Molarity is number of moles divided by volume of the solution.

Mathematically, Molarity = $(no. of moles)/(Volume)$

Also, in the given situation number of moles of both HCl and NaOH are equal. Therefore, volume of HCl will be calculated as follows.

$M_(HCl)V_(HCl)$ = $M_(NaOH)V_(NaOH)$

$0.02 M * V_(HCl)$ = $0.01 M * 100 mL$

$V_(HCl)$ = $(0.01 M * 100mL)/(0.02)$

= 50 mL

Thus, we can conclude that volume of HCl is 50 mL.

The reaction of HCl and NaOH is HCl + NaOH = NaCl + H2O. So the mole number of HCl and NaOH is equal. So the volume of HCl =0.01*0.1/0.02=0.05 L =50 ml. So the answer is D).

An example of a physical property of an element is the element’s ability to(1) react with an acid(2) react with oxygen(3) form a compound with chlorine(4) form an aqueous solution

Answers

Answer is: 4) form an aqueous solution.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change. Making aqueous solution is physical change (solvatation).

Element reactions with acids, oxygen and chlorine are chemical change (chemical reaction combustion), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change (exothermic reaction because energy is released).

4: Form An Aqueous Solution

This is the only answer that can be observed without testing gear and with the naked eye.... Hope I helped ^-^

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