1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tamiku [17]
3 years ago
9

A person uses 770 kcal on a long hike. Calculate the energy used for the hike in each of the following energy units.

Chemistry
1 answer:
Pavlova-9 [17]3 years ago
5 0

Explanation:

1 Cal of energy is equivalent to 4.184 Joules.

A.

770Cal of energy = 3221.680 joules

Therefore, 780kCal of energy = 3221680 Joules.

B.

3200000 Joules (in 2 s.f).

C.

I000 joules = 1 kJoule

3221680 joules = 3221.689 kJoules.

D.

3200 kJ (in 2 s.f).

You might be interested in
The reaction A( g ) ⇌ 2 B( g ) A(g) ⇌ 2 B(g) has an equilibrium constant of K = 0.010 K = 0.010. What is the equilibrium constan
Over [174]

Answer:

K = 10

Explanation:

Using Hess's law, it is possible to obtain the equilibrium constant, K, of a reaction using K of similar reactions. For example:

<em> If A ⇄ B K = X</em>

B ⇄ A K = 1/X

2A ⇄ 2B K = X².

Thus, if A(g) ⇄ 2B(g) K = 0.010

2B(g) ⇄ A(g) K = 1 / 0.010; K = 100

B(g) ⇄ A(g) K = √100 = 10

<h3>K = 10</h3>
5 0
3 years ago
Determine the LIMITING reactant in the following balanced equation:
padilas [110]

Answer:

KBr is limiting reactant.

Explanation:

Given data:

Mass of  KBr =4g

Mass of Cl₂ = 6 g

Limiting reactant = ?

Solution:

Chemical equation:

2KBr + Cl₂      →    2KCl + Br₂

Number of moles of KBr:

Number of moles = mass/molar mass

Number of moles = 4 g/ 119 gmol

Number of moles = 0.03 mol

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 6 g/ 70 gmol

Number of moles = 0.09 mol

Now we will compare the moles of reactant with product.

              KBr            :            KCl

                2              :              2

            0.03            :            0.03

             KBr            :              Br₂

                2             :               1

             0.03           :          1/2×0.03= 0.015

               Cl₂             :            KCl

                 1              :              2

            0.09            :           2/1×0.09 = 0.18

               Cl₂             :              Br₂

                1              :               1

             0.09           :            0.09

Less number of moles of product are formed by the KBr thus it will act as limiting reactant while Cl₂  is present in excess.

5 0
3 years ago
A mixture that has two or more substances that are spread out evenly is called _____
svlad2 [7]

Answer:

D

Explanation:

heterogeneous mixture you can see the different substances that go into it.

homogeneous mixture you can't see the difference, the mixture looks like one substance.

6 0
3 years ago
Can y’all please help me
lys-0071 [83]

Answer The earth is not flat

Explanation:cuz

3 0
2 years ago
What is an example of inentsive property
sergejj [24]

Answer:

See explanation

Explanation:

I'm assuming you're asking about intensive properties. These properties only depend on the type of material, not the amount. Examples include color, temperature, boiling point, and hardness.

5 0
2 years ago
Read 2 more answers
Other questions:
  • Which characteristic of life is demonstrated when eagles use sharp talons to grab fish from the water?
    7·2 answers
  • The atomic number of nitrogen is 7. The mass is 14.01. This means that a) All nitrogen atoms have exactly 7 neutrons b) A small
    15·2 answers
  • If the volume of 0.100M HCl delivered to 10.0mL of NaOH is 12.0mL the NaOH concentration is
    12·1 answer
  • Why is water considered a polar molecule?
    6·1 answer
  • Gasone provides the energy that powers many car engines. In an engine, gasoline and oxygen are mixed together and burned, creati
    13·2 answers
  • Molecular mass expressed in gram is called<br>​
    12·1 answer
  • How many significant figures are needed in the answer when 1.31m is multiplied by 6.5 m​
    12·1 answer
  • In order for sodium to have 8 valence electrons it would need to either gain _____ electrons or lose _____ electron.
    8·1 answer
  • a balloon filled with a volume of 1.50 L is compressed to a volume of 0.50 L at a constant rate of temperature. if the initial p
    7·1 answer
  • 1. How many molecules are in 643.21 grams of
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!