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Marat540 [252]
3 years ago
7

Helium has a density of 1.79 x 10-4 g/mL at standard temperature and pressure. A balloon has a volume of 6.3 liters. Calculate t

he mass of helium that it would take to fill the balloon.
35,000 g
1.1 x 10-3 g
2.8 x 10-5 g
1.1 g
Chemistry
2 answers:
sukhopar [10]3 years ago
7 0
To find the mass you divide multiply volume and density..

Density = 1.79 x 10^-4     Volume = 6.3

(1.79 x 10^-4 )(6.3) =  <span>1.1 x 10^-3 g
</span>
Dafna11 [192]3 years ago
5 0
To find the mass you divide multiply volume and density..

Density = 1.79 x 10^-4     Volume = 6.3

(1.79 x 10^-4 )(6.3) =  <span>1.1 x 10^-3 g
</span>
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Thermal Chemistry [11A.S, 11B.S. 11C.R, 11D.S]:Question 2
777dan777 [17]

Answer:

25 degrees

Explanation:

Q= mc^T

84= (2.0)(4.18)^T

84= 8.36^T

Divide each side by 8.36

^T= 10 degrees

15+ 10= 25

Final temp= 25

5 0
3 years ago
Practice Problem #1: __TiO2 + __Cl2 + __C __TiCl4 + __CO2 + __CO
ICE Princess25 [194]

Answer:

Explanation:

1)

Given data:

Moles of Cl₂ react = ?

Moles of carbon = 4.55 mol

Solution:

Chemical equation:

2TiO₂ + 4Cl₂ + 3C  → 2TiCl₄ + CO₂ + 2CO

Now we will compare the moles of Cl₂ with C.

                         C             :            Cl₂

                         3             :              4

                       4.55         :            4/3×4.55 = 6.1 mol

6.1 moles of chlorine will react with 4.55 moles of C.

2)

Given data:

Mass of TiO₂ react = ?

Moles of carbon = 4.55 mol

Solution:

Chemical equation:

2TiO₂ + 4Cl₂ + 3C  → 2TiCl₄ + CO₂ + 2CO

Now we will compare the moles of Cl₂ with C.

                         C             :            TiO₂

                         3             :              2

                       4.55         :            2/3×4.55 = 3 mol

Mass of TiO₂:

Mass = number of moles × molar mass

Mass = 3 mol × 79.87 g/mol

Mass =  239.61 g

3)

Given data:

Molecules of TiCl₄ formed = ?

Moles of TiO₂ react = 115 g

Solution:

Chemical equation:

2TiO₂ + 4Cl₂ + 3C  → 2TiCl₄ + CO₂ + 2CO

Number of moles of TiO₂:

Number of moles = mass/ molar mass

Number of moles = 115 g/ 79.87 g/mol

Number of moles = 1.44 mol

Now we will compare the moles of Cl₂ with C.

                      TiO₂           :            TiCl₄

                         2             :              2

                       1.44           :            1.44

Molecules of TiCl₄:

1 mole = 6.022 × 10²³ molecules

1.44 ×6.022 × 10²³ molecules

8.672× 10²³ molecules

8 0
4 years ago
Which is a common characthist of both science and pseudoscience
kherson [118]
<span>Science and pseudoscience both use complicated chains of reasoning.</span>
3 0
3 years ago
Which statement most completely describes the role of the cell in a single celled organism
Gwar [14]

<span>Many life forms consist of a single cell. As well as simple bacteria, there are more complex organisms, known as protoctists. Unlike bacteria, they have complex internal structures, such as nuclei containing organized strands of genetic material called chromosomes. Most are single-celled, but some form colonies, with each cell, usually remaining self-sufficient.
</span>
Prokaryotes are unicellular organisms whose cells lack a nucleus. A nucleus is a dense are in a cell that contains nucleic acids the chemical instructions that direct the cell's activities.

Not sure if this really helps but...here you go!
4 0
3 years ago
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes _____. Wh
vovikov84 [41]

Answer:

Reduced

Explanation:

NAD⁺ is an intermediate electron acceptor, acting as an oxidant (together with FAD⁺) that participates in cellular respiration as a fundamental reagent, gaining a hydrogen atom (H) in this process, becoming NADH which will later be oxidized.

This process of converting NAD⁺ to NADH (and FAD⁺ converted to FADH₂) by gaining a hydrogen atom is called reduction.

8 0
3 years ago
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