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
Bezzdna [24]
3 years ago
13

Please help last assignment of the day

Chemistry
1 answer:
Andrej [43]3 years ago
3 0

In this qn, you use the mole formula,

amount (mol) = mass (g) ÷ molar mass

(molar mass is the mass number of an element, which u can find by referring to the periodic table)

so by subbing in the values given to you, you can find the answer

5. amount of Cu = 55.9 ÷ 63.5 = 0.880mol (3sf)

6. amount of N2 = 340 ÷ 2(14.0) = 12.1mol (3sf)

(note: you multiply the molar mass of N by 2 as there are 2 N atoms)

for qn 7 and 8, youre finding the mass and not the amount. By bringing the molar mass over to the other side of the formula, you get

mass = amount (mol) × molar mass

thus,

7. mass of Fe = 0.063 × 55.8 = 3.52g (3sf)

8. mass of H2 = 94.7 × 2(1.0) = 47.4g (3sf)

extra things to take note of:

- likewise, you can also find the molar mass of an element by using

molar mass = mass(g) ÷ amount(mol)

^^ this is commonly only needed when you need to find the molar mass of an isotope. the question will give you the amount and mass of the element, and you just need to factor them in to find your answer.

- typically, you use 3 sf in your final answer and 5sf in your working. remember to write (3sf) at the end of your number statement when necessary.

- when you get an answer of (eg.) 0.6mol, you still need to write it in 3sf, so your answer would be 0.600mol

You might be interested in
Salt dissolves easiest in
denis-greek [22]
I think it's just water right..?
8 0
3 years ago
Read 2 more answers
Snow forms when clouds cool to the dew point. True False
Paha777 [63]

Answer:

False.

Explanation:

Snow forms when tiny ice crystals in clouds stick together to make snowflakes.

3 0
3 years ago
Match the terms to their definitions a reproductive cell
Svetradugi [14.3K]
A cell that reproduces
4 0
3 years ago
Read 2 more answers
What is produced/made when our food is burned? ____________ + ____________ + __________ *
Pavel [41]

Answer:

do you have any vocabulary to help you with this or no

3 0
4 years ago
Convert 59,800 cg/L to g/mL
alexgriva [62]
To convert the given value to the desired one, use the proper unit conversions and dimensional analysis. Use the following conversion for the first set.

    1 g = 100 cg
    1 L = 1000 mL

Using the concept presented above,
         
            V = (59800 cg/L)(1 g/100 cg)1 L/1000 mL)
            V = 0.598 g/mL
6 0
3 years ago
Other questions:
  • Which is smaller a proton, nucleus, or a compound?
    7·2 answers
  • Describe how antibodies protect your body against disease when exposed to a virus
    9·1 answer
  • Proteins are polymers of _____. proteins are polymers of _____. ch2o units amino acids nucleotides glycerol hydrocarbons
    10·1 answer
  • The gas in a 250. mL piston experiences a change in pressure from 1.00 atm to 4.45 atm. What is the new volume (in mL) assuming
    6·1 answer
  • CAN SOMEONE go through this with me pleaseeeSTEP BY STEP AND TELL ME THE ANSWERS!!!thx
    10·1 answer
  • The eyes of reptile pass a single visual signal to the brain when the visual receptors are struck by photons of wavelength of 85
    15·1 answer
  • An atom gains electrons to become negatively charged
    12·1 answer
  • A piece of granite is made up of three basic particles: black, pink, and white particles. If you look at one side of the rock, t
    7·1 answer
  • True or False - Elemental gases are relatively insoluble in water and should be given the state (g).
    11·1 answer
  • Why does atomic radius increase across Period 3?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!