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3 years ago

Which terms are associated with the Cenozoic era: Homo sapiens, mammoth, dinosaur, grass?

Chemistry

1 answer:

abruzzese [7]3 years ago

4 0

Mammoths and dinosaurs lived in the Cenozoic era, and there was also grass. Your answers are Mammoth, dinosaur, grass.

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How to find the number of proton and neutron

VladimirAG [237]

go to periodic table

look for the element you want

find the atomic number on the top right hand side of the element

atomic number = equal to number of proton.

find atomic mass bottom right hand side of the element

atomic mass - atomic number = neutron

i hope this will help

Na atomic number 11 and mass number 23

protons 11

neutron =23-11=12

7 0

3 years ago

Arrange these molecules in order of decreasing mass: C6H14 , NO2 , Fe2O3 , and CaCO

babunello [35]

The following is the arrangement of the given molecules in decreasing order of mass: $\text{ Fe2O3} > \text{C6H14} > \text{CaCO} > \text{NO2}$

Solution:

First inorder to arrange the elements in descending order of their mass we have to calculate the molecular mass of each element. The calculation is as follows:

Mass of C6H14:

$C\rightarrow6\times12.01 = 72.06$

$H\rightarrow14\times1.008 = 14.112$

Mass of C6H14 is 86.172

Mass of NO2:

$N\rightarrow1\times14.0067 = 14.0067$

$O\rightarrow2\times15.9994 = 31.9988$

Mass of NO2 is 46.0055

Mass of Fe2O3:

$Fe\rightarrow2\times55.845 = 111.69$

$O\rightarrow3\times15.9994 = 47.9982$

Mass of Fe2O3 is 159.6882

Mass of CaCO:

$Ca\rightarrow1\times40.078 = 40.078$

$C\rightarrow1\times12.01 = 12.01$

$O\rightarrow1\times15.9994 = 15.9994$

Mass of CaCO will be 68.0874

So, the order will be $159.6882>86.172>68.0874>46.0055$ which is $\text{ Fe2O3} > \text{C6H14} > \text{CaCO} > \text{NO2}$

6 0

3 years ago

How many grams are in 2.3 x 10^-4 moles of Ca3(PO4)2

OLEGan [10]

Molar mass

Ca₃(PO₄)₂ = 310 g/mol

1 mole -------------------> 310 g
2.3x10⁻⁴ mole ---------> ?

m = 2.3x10⁻⁴ * 310 / 1

m = 0.0713 g

hope this helps!

3 0

3 years ago

What are three things that living things need to live

Grace [21]

Food shelter oxygen

8 0

3 years ago

Read 2 more answers

What mass of gallium oxide, Ga₂O3, can be prepared from

Degger [83]

Answer:

(70 x 2 + 16 x 3) x 29/70 x 2 = 38,9428571 g.