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2 years ago

C6H12O6 + 6O2 → 6CO2 + ? H2O + energy Whats the answer? I really don't know,

Chemistry

1 answer:

Ket [755]2 years ago

4 0

Answer: C. 6

Explanation:

According to the Law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction for photosynthesis is :

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O+energy$

Thus the coefficient of water is 6.

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Which of the following statements are true? Significant figures in a measurement are all measured digits, and one estimated digi

Georgia [21]

Answer: Significant figures in a measurement are all measured digits, and one estimated digit

Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.

Explanation:

Significant figures : The figures in a number which express the value or the magnitude of a quantity to a specific degree of accuracy or precision is known as significant digits.

The significant figures of a measured quantity are defined as all the digits known with certainty and the first uncertain or estimated digit.

Rules for significant figures:

1. Digits from 1 to 9 are always significant and have infinite number of significant figures.

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5. All zero’s after the decimal point are always significant.

6 0

3 years ago

5. Determine the number of liters in 4.32 grams of water (H2O). Answer: --_ 5.37L H2O__

MariettaO [177]

Answer:

4.32 $\frac{1}{18.01}$ × $\frac{22.4}{1}$ = 5.37

Explanation:

22.4 is how many liters per mole. 18.01 is the mass of H2O.

8 0

2 years ago

A 3.540-g sample of an unknown metal M is burned in the presence of excess oxygen, producing the oxide M2O3(s) and liberating 18

pshichka [43]

Answer:

a) Sm

Explanation:

Hello,

This substantiation could be done by knowing how to compute the released energy for 1 mol the oxide. Thus, for Sm, the computation turns out into:

$Q=-1823.0\frac{kJ}{mol}*\frac{1molSm_2O_3}{348.72gSm_2O_3} *3.540gSm_2O_3\\Q=-18.5kJ$

The sign just indicates that the heat is released due to the chemical reaction and it matches with the indicated heat in the statement.

Best regards.

3 0

3 years ago