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Rudiy27
3 years ago
5

Which of the following are the starting substances in photosynthesis?

Chemistry
2 answers:
djverab [1.8K]3 years ago
6 0

A. water and carbon dioxide


Misha Larkins [42]3 years ago
3 0

A: water and carbon dioxide.

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Which compound has the highest precent composition by mass of strontium?
PilotLPTM [1.2K]
First find the molar masses of all of the compounds:
SrCl2 = 158.53g/mol
SrI2 = 341.43g/mol
SrO = 103.62g/mol
SrS = 119.68g/mo

Then find the molar mass of Sr in each of the compounds. Since there is only one Sr in every compound, the mass will be the same: 87.62g/mol Sr

Now divide the molar mass of Sr by each of compounds' masses:
SrCl2 = (87.62)/(158.53) = 0.553
SrI2 = (87.62)/(341.43) = 0.257
SrO = (87.62)/(103.62) = 0.846
SrS = (87.62)/(119.68) = 0.732

Now multiply each of the results by 100 to get the percent composition of Sr by mass:
(0.553)(100) = 55.3% Sr in SrCl2
(0.257)(100) = 25.7% Sr in SrI2
(0.846)(100) = 84.6% Sr in SrO
(0.732)(100) = 73.2% Sr in SrS

Thus SrO has the highest percent composition by mass of Sr
4 0
3 years ago
How many moles are in 2.00 g of NaCl?7
coldgirl [10]

Answer:

              0.0342 moles

Explanation:

Moles and Mass are related as,

Moles = Mass / M.Mass

M.Mass of NaCl = 58.44 g/mol

Putting values,

Moles =  2.00 g / 58.44 g/mol

Moles = 0.0342 moles

7 0
3 years ago
HELP PLEASE
Phoenix [80]

<u>mass of reactants = mass of products</u> best represents the law of conservation of mass

Explanation:

This is a law of thermodynamic that applies to chemical reactions. The mass of the reactants must equal to that of the products because energy/mass cannot be destroyed or created. This is why ideally, chemical reactions should be balanced to conform to this law.

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Answer:Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC ... Predict the relative Rf values for the three components in the sample. Hint: See Table 19.3. ... The sample is spotted on a TLC plate and developed in solvent mixture. We are going to predict the ...

Explanation:MORE POWER

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3 years ago
In a step-down transformer, which side has more wire loops?
Marat540 [252]
B. The Secondary side of the step down transformer.
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3 years ago
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