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4 years ago

1930. kg to lb ( need 4 sig fig)

Chemistry

1 answer:

anzhelika [568]4 years ago

5 0

Answer: The correct answer is 4256 lb

Explanation:

We are given:

A numerical value of 1930 kilo grams

To convert this into pounds, we use the conversion factor:

1 kg = 2.205 lb

Converting the given value into pounds, we get:

$\Rightarrow 1930kg\times \frac{2.205lb}{1kg}=4256lb$

Hence, the correct answer is 4256 lb

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1A. A strontium hydroxide solution is prepared by dissolving 10.45 g of Sr(OH)2 in water to make 41.00 mL of solution. What is t

horrorfan [7]

Answer:

1. 0.00352 M

2. 2HNO3(aq) + Sr(OH)2(aq) -----> Sr(NO3)2(aq) + 2H2O(l)

3. 0.00534 M

Explanation:

Mass of strontium hydroxide= 10.45 g

Volume of solution = 41.00 ml

Number of moles = mass of Sr(OH)2/molar mass of Sr(OH)2 = 10.45g/121.63 g/mol= 0.0859 moles

Molarity= number of moles × volume = 0.0859 ×41/1000 = 0.00352 M

2HNO3(aq) + Sr(OH)2(aq) -----> Sr(NO3)2(aq) + 2H2O(l)

Concentration of acid CA= the unknown

Volume of acid VA= 31.5 ml

Concentration of base CB= 0.00352 M

Volume of base VB= 23.9 ml

Number of moles of acid NA= 2

Number of moles of base NB= 1

From;

CAVA/CBVB = NA/NB

CAVANB= CBVBNA

CA= CBVBNA/VANB

CA= 0.00352 × 23.9 ×2/31.5 ×1

CA= 0.00534 M

7 0

3 years ago

Using the periodic table as a reference, which elements could bond to form a compound most like NaCl?

pychu [463]

step by step

Na(sodium)=2.8.1

Cl (Chlorine)=2.8.7. sodium will give the chlorine the 1 valence electron to become stable ions.

answer

pottasium. (2.8.8.1) and Flourine(2.7)

4 0

3 years ago

Ionic bonds Select one: a. result from sharing electrons. b. result from transferring electrons. c. result from like charge attr

Naddika [18.5K]

<h2>Ionic bonds result from transferring of electrons</h2>

Explanation:

Ionic bonds result from transferring of electrons.
An ionic bond is also referred to as an electrovalent bond.
The main reason for the formation of the bond is an electrostatic attraction between oppositely charged ions that are cation and anion in a chemical compound.
The formation of such bonds occurs when the valence (outermost) electrons of one atom are transferred to another atom or the loss of electrons from one atom and gain of electrons of another atom.
The atom that loses the electrons forms cation that is a positively charged ion.

The atom that gains electrons forms an anion that is a negatively charged ion.

6 0

3 years ago

Oxygen has a total of three isotopes Oxygen-16, Oxygen-17, and oxygen-18. With their a.m.u. being 15.995, 16.999, and 17.999 res

Inessa05 [86]

Answer: The percentage abundance of oxygen-16 isotope is 99.76 %

Explanation:

We are given:

Three isotopes of oxygen are there, O-16, O-17 and O-18

Mass of Oxygen-16 isotope = 15.995 amu

Mass of Oxygen-17 isotope = 16.999 amu

Mass of Oxygen-18 isotope = 17.999 amu

Percentage abundance of Oxygen-17 isotope = 0.04 %

Percentage abundance of Oxygen-18 isotope = 0.2 %

We know that:

Percentage abundance of all isotopes together is 100 %

So, Percentage abundance of Oxygen-16 isotope = [100 - (0.04 + 0.2)] = 99.76 %

Hence, the percentage abundance of oxygen-16 isotope is 99.76 %

7 0

4 years ago

What is the number of moles of solute in 0.250 L of solute in 0.250 L of a 0.4M solution

Kazeer [188]

Answer:

Explanation:To find the number of moles of solute in a volume of a solution, we need to multiply volume by concentration. BUT we also need to check that the units are the same. Molarity (M) is moles per liter, so we need to convert 250mL to L.

250mL=0.250L

Now we can multiply the concentration by volume.

0.4M*0.250L

4 0

3 years ago