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Ad libitum [116K]
4 years ago
6

The concentration of sugar (glucose, c6h12o6) in human blood ranges from about 80.0 mg/100. ml before meals to 120. mg/100. ml a

fter eating. find the molarity of glucose in blood before and after eating.
Chemistry
1 answer:
Misha Larkins [42]4 years ago
6 0

Answers:

0.0044 mol·L⁻¹; 0.006 66 mol·L⁻¹

Step-by-step explanation:

(1) <em>Before eating</em>

    80. mg/100. mL                 Convert milligrams to grams

=   80. mg/100. mL × 1 g/1000 mg  

= 0.080 g/100. mL                 Convert grams to moles

= 0.080 g/100. mL × 1 mol/180.16 g

= 4.44 × 10⁻⁴ mol/100. mL     Convert millilitres to litres

= 4.44 × 10⁻⁴ mol/100. mL × 1000 mL/1 L

= 0.0044 mol·L⁻¹

(2) <em>After eating</em>

     120. mg/100. mL                  Convert milligrams to grams

=   120. mg/100. mL × 1 g/1000 mg  

= 0.120 g/100. mL                   Convert grams to moles

= 0.120 g/100. mL × 1 mol/180.16 g

= 6.661 × 10⁻⁴ mol/100. mL     Convert millilitres to litres

= 6.661 × 10⁻⁴ mol/100. mL × 1000 mL/1 L

= 0.006 66 mol·L⁻¹

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3 years ago
How much energy is required to heat 2kg of ice from -5°c to 0°c
balu736 [363]

Explanation:

total heat = Heat required to convert 2 kg of ice to 2 kg of water at 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C.

Heat=mhfg+mCpΔT

Here, m ( mass of ice) = 2 kg

hfg (latent heat of fusion of ice) = 334 KJ

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ΔT(Temperature difference) = 20 °C

Therefore, Heat required = 2 x 334 + 2 x 4.187 x (20 - 0 )

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4 0
3 years ago
Which statements are consistent with Dalton"s atomic theory as it was originally stated? Why? a. Sulfur and oxygen atoms have th
Vlad [161]

The question is incomplete, the complete question is:

Which statements are consistent with Dalton's atomic theory as it was originally stated? Why?

a. Sulfur and oxygen atoms have the same mass.

b. All cobalt atoms are identical.

c. Potassium and chlorine atoms combine in a 1:1 ratio to form potassium chloride.

d. Lead atoms can be converted into gold.

<u>Answer: </u>The correct options are b) and c).

<u>Explanation:</u>

Some of the postulates of Dalton's atomic theory are:

  • All matter is made of very tiny particles called atoms that participate in chemical reactions
  • Atoms are indivisible particles that cannot be created or destroyed in a chemical reaction
  • Atoms of a given element are identical in mass and chemical properties
  • Atoms of different elements have different masses and chemical properties.
  • Atoms combine in the ratio of small whole numbers to form compounds.
  • The relative number and kinds of atoms are constant in a given compound.

For the given options:

<u>For a:</u>

The statement is inconsistent with the theory as no two elements can have the same mass. Only atoms of the same element can have the same mass.

  • <u>For b:</u>

This is consistent with the theory as atoms of the same element are identical.

  • <u>For c: </u>

This is consistent with the theory as atoms combine in a simple whole number ratio.

  • <u>For d:</u>

The statement is inconsistent with the theory as atoms of one element cannot be changed to atoms of other element.

Hence, the correct options are b) and c).

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Answer:

B. and A.

Explanation:

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