Chemistry College

What is the molar mass of H₂CO3?
A. 61 g/mol
B. 62 g/mol
C. 30 g/mol
D. 29 g/mol

Answers

Answer 1

Answer:

ans is b 62 g/mole

because mass of h is 2 an carbon is 12 and 3 atoms of oxygen in 16*3 =48 adding all we get 62 g/mole

Related Questions

Why is CrO named using a roman numeral, chromium (II) oxide, whereas CaOis named without a roman numeral in the name, calcium oxide?

Answers

Answer: Cr (chromium) has multiple oxidation states, while Ca (calcium) only has one.

Explanation: You only specify with a Roman numeral when the metal/positively charged ion in the compound has multiple charges. Chromium is a transition metal, and most transition metals have multiple charges. Calcium is a group 2 metal so it will only have a charge of +2.

Zn(s) + 2HCl(aq) > H2(g) + ZnCl2 (aq)
When 25.0 g of Zn reacts, how many grams of ZnCl2 are produced?
A. 1.5 B. 0.59 C. 104 D. 25 E. 52

Answers

Taking into account the reaction stoichiometry, the correct answer is option E. when 25.0 g of Zn reacts, 52 grams of ZnCl₂ are produced.

Reaction stoichiometry

In first place, the balanced reaction is:

Zn + 2 HCl → H₂ + ZnCl₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Zn: 1 moleHCl: 2 molesH₂: 1 moleZnCl₂: 1 mole

The molar mass of the compounds is:

Zn: 65.37 g/moleHCl: 36.45 g/moleH₂: 2 g/moleZnCl₂: 136.27 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Zn: 1 mole ×65.37 g/mole= 65.37 gramsHCl: 2 moles ×36.45 g/mole= 72.9 gramsH₂: 1 mole ×2 g/mole= 2 gramsZnCl₂: 1 mole ×136.27 g/mole= 136.27 grams

Mass of ZnCl₂ formed

The following rule of three can be applied: if by reaction stoichiometry 63.37 grams of Zn form 136.27 grams of ZnCl₂, 25 grams of Zn form how much mass of ZnCl₂?

mass of ZnCl₂= (25 grams of Zn× 136.27 grams of ZnCl₂)÷ 63.37 grams of Zn

mass of ZnCl₂= 53.76 grams

This mass can be considered approximately equal to 52 grams. Finally, the correct answer is option E. when 25.0 g of Zn reacts, 52 grams of ZnCl₂ are produced.

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What element completes the 7s sub level?

Answers

Answer:

Radium

Explanation:

The doctor orders 525 mg of a medication to be administered every 12 hours. The
medication comes in 150 mg scored tablets. How many tablets need to be administered
to the patient in one day?

Answers

Answer: 7 pills

Explanation:

A day is 24 hours so you multiply 12 x 2 and do the same to 525, 525 x 2 = 1050

then divide 1050 by 150 and you get 7

The world's record for the largest cup of coffee was broken on
October 15. 2010. with a 2010-gal cup of coffee in Las Vegas, Ive
vada. If a cup of coffee contains 473 mL of coffee, how many
cups of coffee would be reauired to till this coffee cup

Answers

The number of cups of coffee in  a 2010-gal cup of coffee  is 16086 cups of coffee

What is the number of cups of coffee in  a 2010-gal cup of coffee?

The  number of cups of coffee in  a 2010-gal cup of coffee is calculated as follows:

Number of cups of coffee = volume of 2010-gal in ml/473 ml

Volume of large cup of coffee = 2010-gal

Number of mL in 1 gal = 3785.41 mL

2010 gal in mL = 2010 * 3785.41

2010 gal in mL = 7608674.1 mL

Number of cups of coffee = 7608674.1 mL/473 mL

Number of cups of coffee = 16086 cups of coffee

In conclusion, the number of cups pf coffee in 2010 gal is obtained using the conversion factor between gal and mL

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If you have a solution of 3M HCl in water, how much solute in grams is there in 250 mL?

Answers

Answer:

27.3 g HCl

Explanation:

**Be sure to arrange the conversion in a way that allows for the cancellation of units.

(Step 1)

Convert milliliters (mL) to liters (L).

1,000 mL = 1 L

 250 mL                1 L
---------------  x  -----------------  =  0.25 L
                         1,000 mL

(Step 2)

Use the molarity ratio to find the moles of HCl.

Molarity = moles / L

3 M = moles / 0.25 L

0.75 = moles

(Step 3)

Convert moles to grams using the molar mass of HCl.

Molar Mass (HCl): 1.008 g/mol + 35.453 g/mol

Molar Mass (HCl): 36.461 g/mol

0.75 moles HCl             36.461 g
--------------------------  x  --------------------  =  27.3 g HCl
                                         1 mole

Learning Task No. 2: Study the diagram above. Answer the guide questions.
Guide Questions:
1. What do you call the force acting on the ball along the horizontal line or
along the force that makes the ball in motion?
2. What makes the ball stop on rolling after sometime?
3. What makes the ball keep on rolling?

Answers

1. "Fn" stands for "Normal Force," "Fg" for "Gravity Force," "Ff" for "Force Friction," and "A" for "Applied Force." 2. As a result of the friction, which causes the ball to stop. 3. The reason the ball rolls is due to the force that is imparted to it.

The definition of force is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A force that opposes this motion of the hands is activated when they brush against one another. Frictional force is the force resisting motion applied in the direction perpendicular to the direction of motion of the hands.

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